XChangeSaveSet 3X11 __xorgversion__ XLIB FUNCTIONS XChangeSaveSet XAddToSaveSet XRemoveFromSaveSet change a client's save set int XChangeSaveSet ( Display *display , Window w , int change_mode ); int XAddToSaveSet ( Display *display , Window w ); int XRemoveFromSaveSet ( Display *display , Window w ); change_mode Specifies the mode. You can pass  SetModeInsert  or  SetModeDelete . display Specifies the connection to the X server. w Specifies the window that you want to add or delete from the client's save-set. Depending on the specified mode,  XChangeSaveSet  either inserts or deletes the specified window from the client's save-set. The specified window must have been created by some other client, or a  BadMatch  error results.  XChangeSaveSet  can generate  BadMatch ,  BadValue , and  BadWindow  errors. The  XAddToSaveSet  function adds the specified window to the client's save-set. The specified window must have been created by some other client, or a  BadMatch  error results.  XAddToSaveSet  can generate  BadMatch  and  BadWindow  errors. The  XRemoveFromSaveSet  function removes the specified window from the client's save-set. The specified window must have been created by some other client, or a  BadMatch  error results.  XRemoveFromSaveSet  can generate  BadMatch  and  BadWindow  errors.  BadMatch  Some argument or pair of arguments has the correct type and range but fails to match in some other way required by the request.  BadValue  Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error.  BadWindow  A value for a Window argument does not name a defined Window. XReparentWindow(3X11) Xlib - C Language X Interface