hpux man page for xscreen

XScreen()																 XScreen()

Name
  XScreenCount, XScreenNumberOfScreen, XScreenOfDisplay, ScreenCount, ScreenNumberOfScreen, ScreenOfDisplay - get screen information.

Synopsis
  int XScreenCount(display)
	   Display *display;
  int XScreenNumberOfScreen(screen)
	   Screen *screen;
  Screen *XScreenOfDisplay(display, screen_number)
	   Display *display;
	   int screen_number;

Arguments
  display   Specifies a connection to an X server; returned from XOpenDisplay().

  screen    Specifies the appropriate Screen structure.

  screen_number
	    Specifies the appropriate screen number on the host server.

Returns
  The number of screens, a screen number, or a Screen structure.

Description
  XScreenCount()  returns the number of screens on the specified display.  XScreenNumberOfScreen() returns a screen number given a pointer to
  a Screen structure.  XScreenOfDisplay() returns pointer to a	Screen	structure  given  the  screen  number.	 XScreenNumberOfScreen()  and
  XScreenOfDisplay() are opposites.

  The C language macros ScreenCount(), ScreenNumberOfScreen(), and ScreenOfDisplay() are equivalent and slightly more efficient.

See Also
  XDefaultScreenOfDisplay(), XDefaultScreen*().

Xlib - Macro Equivalents														 XScreen()