Make QueryMonitor() slightly less insane, making it return TRUE if the
specified monitor exists, rather than always returning TRUE (which we
are uselessly checking, and then also checking if the specified monitor
exists)
(Note that EnumDisplayMonitors() doesn't seem to have meaningful way to
return errors, see 5940580f)
Also: Spamming the long UseMsg() after "Invalid monitor number" isn't very
helpful.
Also: If we are exiting in ddxProcessArgument() due to an error in
options, use a non-zero exit status.
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
All questions regarding this software should be directed at the Xorg mailing list:
https://lists.freedesktop.org/mailman/listinfo/xorg
The master development code repository can be found at:
https://gitlab.freedesktop.org/xorg/xserver
For patch submission instructions, see:
https://www.x.org/wiki/Development/Documentation/SubmittingPatches
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