Open a window on Linux

I was looking around the web for a tutorial on how to open a window with C++. And I kept coming across the windows.h header file.

Is this header file for the windows operating system only, or can it be used on Linux?? If it can't what are the alternatives?
It is Microsoft Windows only.

On *nix the OS API is xlib, but you really don't want to mess with that directly. Use a GUI toolkit.

Best choices (in no particular order):

Trolltech Qt
http://trolltech.com/

GTK+
http://www.gtk.org/
http://sourceforge.net/projects/gtkpp/

wxWidgets
http://www.wxwidgets.org/

FLTK
http://www.fltk.org/

FOX
http://www.fox-toolkit.org/

You may also want to peruse The GUI Toolkit, Framework Page
http://www.free-soft.org/guitool/

Hope this helps.
Thanks Duos, I by accident (I really just forgot I made this post) reposted this question in the beginner section. Just disregard it!
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