diff --git a/client.c b/client.c
index 6f1a48c07..e57dbc91c 100644
--- a/client.c
+++ b/client.c
@@ -33,7 +33,6 @@
 #include "screen.h"
 #include "titlebar.h"
 #include "lua.h"
-#include "stack.h"
 #include "mouse.h"
 #include "systray.h"
 #include "layouts/floating.h"
@@ -269,6 +268,57 @@ client_focus(client_t *c)
     widget_invalidate_cache(c->screen, WIDGET_CACHE_CLIENTS);
 }
 
+/** Stack a window below.
+ * \param c The client.
+ * \param previous The previous window on the stack.
+ * \param return The next-previous!
+ */
+static xcb_window_t
+client_stack_below(client_t *c, xcb_window_t previous)
+{
+    uint32_t config_win_vals[2];
+
+    config_win_vals[0] = previous;
+    config_win_vals[1] = XCB_STACK_MODE_BELOW;
+
+    if(c->titlebar
+       && c->titlebar->sw
+       && c->titlebar->position)
+    {
+        xcb_configure_window(globalconf.connection,
+                             c->titlebar->sw->window,
+                             XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE,
+                             config_win_vals);
+        config_win_vals[0] = c->titlebar->sw->window;
+    }
+    xcb_configure_window(globalconf.connection, c->win,
+                         XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE,
+                         config_win_vals);
+    config_win_vals[0] = c->win;
+
+    return c->win;
+}
+
+/** Get the real layer of a client according to its attribute (fullscreen, …)
+ * \param c The client.
+ * \return The real layer.
+ */
+static layer_t
+client_layer_translator(client_t *c)
+{
+    if(c->isontop)
+        return LAYER_ONTOP;
+    else if(c->ismodal)
+        return LAYER_MODAL;
+    else if(c->isfullscreen)
+        return LAYER_FULLSCREEN;
+    else if(c->isabove)
+        return LAYER_ABOVE;
+    else if(c->isfloating)
+        return LAYER_FLOAT;
+    return c->layer;
+}
+
 /** Restack clients.
  * \todo It might be worth stopping to restack everyone and only stack `c'
  * relatively to the first matching in the list.
@@ -285,26 +335,11 @@ client_stack(void)
     config_win_vals[0] = XCB_NONE;
     config_win_vals[1] = XCB_STACK_MODE_BELOW;
 
-    /* first stack fullscreen and modal windows */
+    /* first stack modal and fullscreen windows */
     for(layer = LAYER_OUTOFSPACE - 1; layer >= LAYER_FULLSCREEN; layer--)
         for(node = globalconf.stack; node; node = node->next)
-            if(node->client->layer == layer)
-            {
-                if(node->client->titlebar
-                   && node->client->titlebar->sw
-                   && node->client->titlebar->position)
-                {
-                    xcb_configure_window(globalconf.connection,
-                                         node->client->titlebar->sw->window,
-                                         XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE,
-                                         config_win_vals);
-                    config_win_vals[0] = node->client->titlebar->sw->window;
-                }
-                xcb_configure_window(globalconf.connection, node->client->win,
-                                     XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE,
-                                     config_win_vals);
-                config_win_vals[0] = node->client->win;
-            }
+            if(client_layer_translator(node->client) == layer)
+                config_win_vals[0] = client_stack_below(node->client, config_win_vals[0]);
 
     /* then stack statusbar window */
     for(screen = 0; screen < globalconf.screens_info->nscreen; screen++)
@@ -321,34 +356,8 @@ client_stack(void)
     /* finally stack everything else */
     for(layer = LAYER_FULLSCREEN - 1; layer >= LAYER_DESKTOP; layer--)
         for(node = globalconf.stack; node; node = node->next)
-            if(node->client->layer == layer)
-            {
-                if(node->client->titlebar
-                   && node->client->titlebar->sw
-                   && node->client->titlebar->position)
-                {
-                    xcb_configure_window(globalconf.connection,
-                                         node->client->titlebar->sw->window,
-                                         XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE,
-                                         config_win_vals);
-                    config_win_vals[0] = node->client->titlebar->sw->window;
-                }
-                xcb_configure_window(globalconf.connection, node->client->win,
-                                     XCB_CONFIG_WINDOW_SIBLING | XCB_CONFIG_WINDOW_STACK_MODE,
-                                     config_win_vals);
-                config_win_vals[0] = node->client->win;
-            }
-}
-
-/** Put client on top of the stack
- * \param c The client to raise.
- */
-void
-client_raise(client_t *c)
-{
-    /* Push c on top of the stack. */
-    stack_client_push(c);
-    client_stack();
+            if(client_layer_translator(node->client) == layer)
+                config_win_vals[0] = client_stack_below(node->client, config_win_vals[0]);
 }
 
 /** Manage a new client.
@@ -396,7 +405,7 @@ client_manage(xcb_window_t w, xcb_get_geometry_reply_t *wgeom, int screen)
     c->geometry.y = c->f_geometry.y = c->m_geometry.y = wgeom->y;
     c->geometry.width = c->f_geometry.width = c->m_geometry.width = wgeom->width;
     c->geometry.height = c->f_geometry.height = c->m_geometry.height = wgeom->height;
-    c->layer = c->oldlayer = LAYER_TILE;
+    c->layer = LAYER_TILE;
     client_setborder(c, wgeom->border_width);
     c->icon = ewmh_window_icon_get_reply(ewmh_icon_cookie);
 
@@ -526,7 +535,7 @@ client_resize(client_t *c, area_t geometry, bool hints)
      * stored according to 'value_mask' */
     uint32_t values[5];
 
-    if(c->titlebar && !c->ismoving && !c->isfloating && layout != layout_floating)
+    if(c->titlebar && !c->ismoving && !c->isfloating && !c->isfullscreen && layout != layout_floating)
         geometry = titlebar_geometry_remove(c->titlebar, c->border, geometry);
 
     if(hints)
@@ -566,7 +575,7 @@ client_resize(client_t *c, area_t geometry, bool hints)
            || layout_get_current(new_screen) == layout_floating)
         {
             titlebar_update_geometry_floating(c);
-            if(!c->ismax)
+            if(!c->isfullscreen)
                 c->f_geometry = geometry;
         }
 
@@ -615,21 +624,16 @@ client_setfloating(client_t *c, bool floating)
     {
         if((c->isfloating = floating))
         {
-            client_setlayer(c, MAX(c->layer, LAYER_FLOAT));
-            client_resize(c, c->f_geometry, false);
-            titlebar_update_geometry_floating(c);
+            if(!c->isfullscreen)
+            {
+                client_resize(c, c->f_geometry, false);
+                titlebar_update_geometry_floating(c);
+            }
         }
-        else if(c->ismax)
-        {
-            c->ismax = false;
-            client_setlayer(c, c->oldlayer);
-            client_resize(c, c->m_geometry, false);
-        }
-        else
-            client_setlayer(c, c->oldlayer);
         client_need_arrange(c);
         widget_invalidate_cache(c->screen, WIDGET_CACHE_CLIENTS);
         client_saveprops(c);
+        client_stack();
     }
 }
 
@@ -648,6 +652,106 @@ client_setsticky(client_t *c, bool s)
     }
 }
 
+/** Set a client fullscreen, or not.
+ * \param c The client.
+ * \param s Set or not the client fullscreen.
+ */
+void
+client_setfullscreen(client_t *c, bool s)
+{
+    if(c->isfullscreen != s)
+    {
+        area_t geometry;
+
+        /* become fullscreen! */
+        if((c->isfullscreen = s))
+        {
+            /* disable titlebar and borders */
+            if(c->titlebar && c->titlebar->sw && (c->titlebar->oldposition = c->titlebar->position))
+            {
+                xcb_unmap_window(globalconf.connection, c->titlebar->sw->window);
+                c->titlebar->position = Off;
+            }
+            geometry = screen_area_get(&globalconf.screens[c->screen].geometry,
+                                       NULL,
+                                       &globalconf.screens[c->screen].padding);
+            c->m_geometry = c->geometry;
+            c->oldborder = c->border;
+            client_setborder(c, 0);
+            c->noborder = true;
+        }
+        else
+        {
+            /* restore borders and titlebar */
+            if(c->titlebar && c->titlebar->sw && (c->titlebar->position = c->titlebar->oldposition))
+                xcb_map_window(globalconf.connection, c->titlebar->sw->window);
+            geometry = c->m_geometry;
+            c->noborder = false;
+            client_setborder(c, c->oldborder);
+            client_resize(c, c->m_geometry, false);
+        }
+        client_resize(c, geometry, false);
+        client_need_arrange(c);
+        client_stack();
+    }
+}
+
+/** Set a client above, or not.
+ * \param c The client.
+ * \param s Set or not the client above.
+ */
+void
+client_setabove(client_t *c, bool s)
+{
+    if(c->isabove != s)
+    {
+        c->isabove = s;
+        client_stack();
+    }
+}
+
+/** Set a client below, or not.
+ * \param c The client.
+ * \param s Set or not the client below.
+ */
+void
+client_setbelow(client_t *c, bool s)
+{
+    if(c->isbelow != s)
+    {
+        c->isbelow = s;
+        client_stack();
+    }
+}
+
+/** Set a client modal, or not.
+ * \param c The client.
+ * \param s Set or not the client moda.
+ */
+void
+client_setmodal(client_t *c, bool s)
+{
+    if(c->ismodal != s)
+    {
+        c->ismodal = s;
+        client_stack();
+    }
+}
+
+/** Set a client ontop, or not.
+ * \param c The client.
+ * \param s Set or not the client moda.
+ */
+void
+client_setontop(client_t *c, bool s)
+{
+    if(c->isontop != s)
+    {
+        c->isontop = s;
+        client_stack();
+    }
+}
+
 /** Save client properties as an X property.
  * \param c The client.
  */
@@ -1207,6 +1311,9 @@ luaA_client_newindex(lua_State *L)
       case A_TK_BORDER_WIDTH:
         client_setborder(*c, luaL_checknumber(L, 3));
         break;
+      case A_TK_ONTOP:
+        client_setontop(*c, luaA_checkboolean(L, 3));
+        break;
       case A_TK_BORDER_COLOR:
         if((buf = luaL_checklstring(L, 3, &len))
            && xcolor_init_reply(globalconf.connection,
@@ -1272,6 +1379,7 @@ luaA_client_newindex(lua_State *L)
  * \lfield urgent The client urgent state.
  * \lfield focus The focused client.
  * \lfield opacity The client opacity between 0 and 1.
+ * \lfield ontop The client is on top of every other windows.
  */
 static int
 luaA_client_index(lua_State *L)
@@ -1371,6 +1479,9 @@ luaA_client_index(lua_State *L)
       case A_TK_FLOATING:
         lua_pushboolean(L, (*c)->isfloating);
         break;
+      case A_TK_ONTOP:
+        lua_pushboolean(L, (*c)->isontop);
+        break;
       case A_TK_STICKY:
         lua_pushboolean(L, (*c)->issticky);
         break;
diff --git a/client.h b/client.h
index 056f9d797..858def8cf 100644
--- a/client.h
+++ b/client.h
@@ -25,6 +25,7 @@
 #include <xcb/xcb_icccm.h>
 
 #include "structs.h"
+#include "stack.h"
 
 #define client_need_arrange(c) \
     do { \
@@ -38,7 +39,6 @@ bool client_isvisible(client_t *, int);
 client_t * client_getbywin(xcb_window_t);
 void client_setlayer(client_t *, layer_t);
 void client_stack(void);
-void client_raise(client_t *);
 void client_ban(client_t *);
 void client_unban(client_t *);
 void client_manage(xcb_window_t, xcb_get_geometry_reply_t *, int);
@@ -52,6 +52,11 @@ void client_saveprops(client_t *);
 void client_kill(client_t *);
 void client_setfloating(client_t *, bool);
 void client_setsticky(client_t *, bool);
+void client_setabove(client_t *, bool);
+void client_setbelow(client_t *, bool);
+void client_setmodal(client_t *, bool);
+void client_setontop(client_t *, bool);
+void client_setfullscreen(client_t *, bool);
 void client_setborder(client_t *, int);
 
 int luaA_client_newindex(lua_State *);
@@ -60,5 +65,17 @@ int luaA_client_userdata_new(lua_State *, client_t *);
 
 DO_SLIST(client_t, client, client_unref)
 
+/** Put client on top of the stack
+ * \param c The client to raise.
+ */
+static inline void
+client_raise(client_t *c)
+{
+    /* Push c on top of the stack. */
+    stack_client_push(c);
+    client_stack();
+}
+
+
 #endif
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
diff --git a/common/tokenize.gperf b/common/tokenize.gperf
index 06ae2146e..63bae7e25 100644
--- a/common/tokenize.gperf
+++ b/common/tokenize.gperf
@@ -39,6 +39,7 @@ ncol
 nmaster
 name
 on
+ontop
 opacity
 pid
 plot_data_add
diff --git a/event.c b/event.c
index a5cccfd3e..f8a8f6714 100644
--- a/event.c
+++ b/event.c
@@ -214,7 +214,7 @@ event_handle_configurerequest(void *data __attribute__ ((unused)),
         if(geometry.x != c->geometry.x || geometry.y != c->geometry.y
            || geometry.width != c->geometry.width || geometry.height != c->geometry.height)
         {
-            if(c->isfloating || layout_get_current(c->screen) == layout_floating)
+            if(c->isfloating || c->isfullscreen || layout_get_current(c->screen) == layout_floating)
             {
                 client_resize(c, geometry, false);
                 titlebar_draw(c);
@@ -542,7 +542,7 @@ event_handle_propertynotify(void *data __attribute__ ((unused)),
     {
         if(ev->atom == WM_TRANSIENT_FOR)
         {
-            if(!c->isfloating)
+            if(!c->isfloating && !c->isfullscreen)
             {
                 xcb_window_t trans;
                 xcb_get_wm_transient_for_reply(connection,
diff --git a/ewmh.c b/ewmh.c
index 54be79aea..bcca6b0dd 100644
--- a/ewmh.c
+++ b/ewmh.c
@@ -266,74 +266,31 @@ ewmh_process_state_atom(client_t *c, xcb_atom_t state, int set)
     }
     else if(state == _NET_WM_STATE_FULLSCREEN)
     {
-        area_t geometry = c->geometry;
         if(set == _NET_WM_STATE_REMOVE)
-        {
-            /* restore geometry */
-            geometry = c->m_geometry;
-            /* restore borders and titlebar */
-            if(c->titlebar && c->titlebar->sw && (c->titlebar->position = c->titlebar->oldposition))
-                xcb_map_window(globalconf.connection, c->titlebar->sw->window);
-            c->noborder = false;
-            c->ismax = false;
-            client_setlayer(c, c->oldlayer);
-            client_setborder(c, c->oldborder);
-            client_setfloating(c, c->wasfloating);
-        }
+            client_setfullscreen(c, false);
         else if(set == _NET_WM_STATE_ADD)
-        {
-            geometry = screen_area_get(&globalconf.screens[c->screen].geometry,
-                                       NULL,
-                                       &globalconf.screens[c->screen].padding);
-            /* save geometry */
-            c->m_geometry = c->geometry;
-            c->wasfloating = c->isfloating;
-            /* disable titlebar and borders */
-            if(c->titlebar && c->titlebar->sw && (c->titlebar->oldposition = c->titlebar->position))
-            {
-                xcb_unmap_window(globalconf.connection, c->titlebar->sw->window);
-                c->titlebar->position = Off;
-            }
-            c->ismax = true;
-            c->oldborder = c->border;
-            client_setborder(c, 0);
-            c->noborder = true;
-            c->oldlayer = c->layer;
-            client_setlayer(c, LAYER_FULLSCREEN);
-            client_setfloating(c, true);
-        }
-        widget_invalidate_cache(c->screen, WIDGET_CACHE_CLIENTS);
-        client_resize(c, geometry, false);
+            client_setfullscreen(c, true);
     }
     else if(state == _NET_WM_STATE_ABOVE)
     {
         if(set == _NET_WM_STATE_REMOVE)
-            client_setlayer(c, c->oldlayer);
+            client_setabove(c, false);
         else if(set == _NET_WM_STATE_ADD)
-        {
-            c->oldlayer = c->layer;
-            client_setlayer(c, LAYER_ABOVE);
-        }
+            client_setabove(c, true);
     }
     else if(state == _NET_WM_STATE_BELOW)
     {
         if(set == _NET_WM_STATE_REMOVE)
-            client_setlayer(c, c->oldlayer);
+            client_setbelow(c, false);
         else if(set == _NET_WM_STATE_ADD)
-        {
-            c->oldlayer = c->layer;
-            client_setlayer(c, LAYER_BELOW);
-        }
+            client_setbelow(c, true);
     }
     else if(state == _NET_WM_STATE_MODAL)
     {
         if(set == _NET_WM_STATE_REMOVE)
-            client_setlayer(c, c->oldlayer);
+            client_setmodal(c, false);
         else if(set == _NET_WM_STATE_ADD)
-        {
-            c->oldlayer = c->layer;
-            client_setlayer(c, LAYER_MODAL);
-        }
+            client_setmodal(c, true);
     }
     else if(state == _NET_WM_STATE_HIDDEN)
     {
diff --git a/layouts/fibonacci.c b/layouts/fibonacci.c
index f206c6354..a59a91c90 100644
--- a/layouts/fibonacci.c
+++ b/layouts/fibonacci.c
@@ -42,7 +42,6 @@ layout_fibonacci(int screen, int shape)
     for(c = globalconf.clients; c; c = c->next)
         if(IS_TILED(c, screen))
         {
-            c->ismax = false;
             if((i % 2 && geometry.height / 2 > 2 * c->border)
                || (!(i % 2) && geometry.width / 2 > 2 * c->border))
             {
diff --git a/layouts/floating.c b/layouts/floating.c
index 678149bd6..77565c187 100644
--- a/layouts/floating.c
+++ b/layouts/floating.c
@@ -31,7 +31,7 @@ layout_floating(int screen)
     client_t *c;
 
     for(c = globalconf.clients; c; c = c->next)
-        if(client_isvisible(c, screen) && !c->ismax)
+        if(client_isvisible(c, screen) && !c->isfullscreen)
             client_resize(c, c->f_geometry, false);
 }
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
diff --git a/mouse.c b/mouse.c
index a4f3535f8..1fd3e51cf 100644
--- a/mouse.c
+++ b/mouse.c
@@ -507,11 +507,9 @@ mouse_client_move(client_t *c, int snap, bool infobox)
     mouse_query_pointer(root, &last_x, &last_y, NULL);
 
     /* grab pointer */
-    if(!mouse_grab_pointer(root, CurMove))
+    if(c->isfullscreen || !mouse_grab_pointer(root, CurMove))
         return;
 
-    c->ismax = false;
-
     if(infobox && (c->isfloating || layout == layout_floating))
         sw = mouse_infobox_new(c->phys_screen, c->border, c->geometry, &ctx);
 
@@ -956,6 +954,9 @@ mouse_client_resize(client_t *c, corner_t corner, bool infobox)
     layout_t *layout;
     xcb_screen_t *s;
 
+    if(c->isfullscreen)
+        return;
+
     curtags = tags_get_current(c->screen);
     layout = curtags[0]->layout;
     s = xutil_screen_get(globalconf.connection, c->phys_screen);
@@ -966,7 +967,7 @@ mouse_client_resize(client_t *c, corner_t corner, bool infobox)
         if(c->isfixed)
             goto bailout;
 
-        c->ismax = false;
+        client_setfullscreen(c, false);
 
         mouse_client_resize_floating(c, corner, infobox);
     }
diff --git a/screen.c b/screen.c
index ce6daa680..e1cb035ff 100644
--- a/screen.c
+++ b/screen.c
@@ -170,7 +170,7 @@ screen_client_moveto(client_t *c, int new_screen, bool doresize)
         if(new_f_geometry.y + new_f_geometry.height >= to.y + to.height)
             new_f_geometry.y = to.y + to.height - new_f_geometry.height - 2 * c->border;
 
-        if(c->ismax)
+        if(c->isfullscreen)
         {
             new_geometry = c->geometry;
 
diff --git a/structs.h b/structs.h
index ec02bbe04..ba5b53459 100644
--- a/structs.h
+++ b/structs.h
@@ -44,6 +44,7 @@ typedef enum
     LAYER_ABOVE,
     LAYER_FULLSCREEN,
     LAYER_MODAL,
+    LAYER_ONTOP,
     LAYER_OUTOFSPACE
 } layer_t;
 
@@ -273,18 +274,24 @@ struct client_t
     bool issticky;
     /** Has urgency hint */
     bool isurgent;
-    /** Store previous floating state before maximizing */
-    bool wasfloating;
     /** true if the window is floating */
     bool isfloating;
     /** true if the window is fixed */
     bool isfixed;
-    /** true if the window is maximized */
-    bool ismax;
     /** true if the client is moving */
     bool ismoving;
     /** True if the client is hidden */
     bool ishidden;
+    /** True if the client is fullscreen */
+    bool isfullscreen;
+    /** True if the client is above others */
+    bool isabove;
+    /** True if the client is below others */
+    bool isbelow;
+    /** True if the client is modal */
+    bool ismodal;
+    /** True if the client is on top */
+    bool isontop;
     /** true if the client must be skipped from task bar client list */
     bool skiptb;
     /** Window of the client */
@@ -294,7 +301,7 @@ struct client_t
     /** Client physical screen */
     int phys_screen;
     /** Layer in the stacking order */
-    layer_t layer, oldlayer;
+    layer_t layer;
     /** Path to an icon */
     char *icon_path;
     /** Titlebar */
diff --git a/tag.h b/tag.h
index 87335f1bd..6f2f7ed2f 100644
--- a/tag.h
+++ b/tag.h
@@ -26,7 +26,7 @@
 #include "common/refcount.h"
 
 /** Check if a client is tiled */
-#define IS_TILED(client, screen)            (client && !client->isfloating && !client->ismax && client_isvisible(client, screen))
+#define IS_TILED(client, screen)            (client && !client->isfloating && !client->isfullscreen && client_isvisible(client, screen))
 
 /* Contructor, destructor and referencors */
 tag_t *tag_new(const char *, ssize_t, layout_t *, double, int, int);