XUnmapWindow, XUnmapSubwindows - unmap windows
int XUnmapWindow(Display *display, Window w);
int XUnmapSubwindows(Display *display, Window
  w);
  - display
- Specifies the connection to the X server.
- w
- Specifies the window.
The XUnmapWindow function unmaps the specified window and causes the X
  server to generate an UnmapNotify event. If the specified window is
  already unmapped, XUnmapWindow has no effect. Normal exposure
  processing on formerly obscured windows is performed. Any child window will no
  longer be visible until another map call is made on the parent. In other
  words, the subwindows are still mapped but are not visible until the parent is
  mapped. Unmapping a window will generate Expose events on windows that
  were formerly obscured by it.XUnmapWindow can generate a BadWindow error.
The XUnmapSubwindows function unmaps all subwindows for the
    specified window in bottom-to-top stacking order. It causes the X server to
    generate an UnmapNotify event on each subwindow and Expose
    events on formerly obscured windows. Using this function is much more
    efficient than unmapping multiple windows one at a time because the server
    needs to perform much of the work only once, for all of the windows, rather
    than for each window.
XUnmapSubwindows can generate a BadWindow error.
  - BadWindow
- A value for a Window argument does not name a defined Window.
XChangeWindowAttributes(3), XConfigureWindow(3), XCreateWindow(3),
  XDestroyWindow(3), XMapWindow(3) XRaiseWindow(3)
Xlib - C Language X Interface