diff -up tabbed_orig/config.def.h tabbed/config.def.h
--- tabbed_orig/config.def.h	2012-12-03 20:53:58.198447147 +0100
+++ tabbed/config.def.h	2012-12-03 21:06:43.946637693 +0100
@@ -14,6 +14,7 @@ static const Bool foreground    = True;
 #define MODKEY ControlMask
 static Key keys[] = { \
 	/* modifier                     key        function        argument */
+	{ 0,                            XK_F11,    fullscreen,     { 0 } },
 	{ MODKEY|ShiftMask,             XK_Return, focusonce,      { 0 } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          { 0 } },
 	{ MODKEY|ShiftMask,             XK_l,      rotate,         { .i = +1 } },
diff -up tabbed_orig/tabbed.c tabbed/tabbed.c
--- tabbed_orig/tabbed.c	2012-12-03 20:53:58.198447147 +0100
+++ tabbed/tabbed.c	2012-12-03 21:09:43.313574156 +0100
@@ -49,7 +49,7 @@
 #define TEXTW(x)                 (textnw(x, strlen(x)) + dc.font.height)
 
 enum { ColFG, ColBG, ColLast };                         /* color */
-enum { WMProtocols, WMDelete, WMName, XEmbed, WMLast }; /* default atoms */
+enum { WMProtocols, WMDelete, WMName, WMState, WMFullscreen, XEmbed, WMLast }; /* default atoms */
 
 typedef union {
 	int i;
@@ -103,6 +103,7 @@ static void expose(const XEvent *e);
 static void focus(int c);
 static void focusin(const XEvent *e);
 static void focusonce(const Arg *arg);
+static void fullscreen(const Arg *arg);
 static int getclient(Window w);
 static unsigned long getcolor(const char *colstr);
 static int getfirsttab(void);
@@ -463,6 +464,20 @@ focusonce(const Arg *arg) {
 	nextfocus = True;
 }
 
+void
+fullscreen(const Arg *arg) {
+	XEvent e;
+	
+	e.type = ClientMessage;
+	e.xclient.window = win;
+	e.xclient.message_type = wmatom[WMState];
+	e.xclient.format = 32;
+	e.xclient.data.l[0] = 2;
+	e.xclient.data.l[1] = wmatom[WMFullscreen];
+	e.xclient.data.l[2] = 0;
+	XSendEvent(dpy, root, False, SubstructureNotifyMask, &e);
+}
+
 int
 getclient(Window w) {
 	int i;
@@ -839,6 +854,8 @@ setup(void) {
 	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 	wmatom[XEmbed] = XInternAtom(dpy, "_XEMBED", False);
 	wmatom[WMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
+	wmatom[WMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
+	wmatom[WMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
 
 	/* init appearance */
 	wx = 0;