Ah, thanks. The wording of it got me thrown off. One way I have found that works to actually remove decorationsis the _MOTIF_WM_HINTS property, and it uses the following structure in the data argument of xcb_change_property: struct { uint32_t flags; uint32_t functions; uint32_t decorations; int32_t inputMode; uint32_t status; } Hints; Kind of off topic but is there any official XCB structure for this yet? <div class="gmail_quote">On Fri, Dec 31, 2010 at 8:41 PM, Vincent Torri <<a href="mailto:vtorri@univ-evry.fr">vtorri@univ-evry.fr</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div class="im"> On Fri, 31 Dec 2010, Cinolt wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> I want to create my window to fill the entire screen with no decorations. According to the EWMH specification, I should set the _NET_WM_STATE property to have the _NET_WM_STATE_FULLSCREEN atom ( <a href="http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#id2507241" target="_blank">http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#id2507241</a> ). How should I do this in XCB? This is my failed attempt, it appears as a regular window: </blockquote> </div> The documentation says: "_NET_WM_STATE_FULLSCREEN indicates that the window should fill the entire screen and have no window decorations. Additionally the Window Manager is responsible for restoring the original geometry after a switch from fullscreen back to normal window. For example, a presentation program would use this hint." so that atom just **indicates** (to the Window manager) that your window is fullscreen (hence, for example (i think) the Window manager does not draw the border of the window). It's up to you to create a widnow of the size of the screen. Vincent Torri<div><div></div><div class="h5"> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> ... xcb_connection_t* c = xcb_connect(0, 0); ... xcb_window_t w = xcb_generate_id(c); ... xcb_intern_atom_cookie_t cookie = xcb_intern_atom(c, 0, 12, "_NET_WM_STATE"); xcb_intern_atom_reply_t* reply = xcb_intern_atom_reply(c, cookie, 0); xcb_intern_atom_cookie_t cookie2 = xcb_intern_atom(c, 0, 24, "_NET_WM_STATE_FULLSCREEN"); xcb_intern_atom_reply_t* reply2 = xcb_intern_atom_reply(c, cookie2, 0); xcb_change_property(c, XCB_PROP_MODE_REPLACE, w, (*reply).atom, ATOM, 32, 1, &((reply2).atom); ... I can set other properties such as the window name, so the other irrelevant code should be fine. Thanks in advance. </blockquote> </div></div></blockquote></div>