using point and click programs

Alright i know i have been told that a gui is for making like a program that allows you to point and click for something to happen but if that is a GUI what is a GDI?

alright thank you but um an addition question if they are infact wo compleatly seperate things would you know of any good sites or books to learn to make a GUI unless you can basicly do the same GDI
Well, GDI (graphics device interface) is basically about drawing: lines, circles, etc. (it's solely windows)
It is rather low level.

GUI (graphical user interface):

http://en.wikipedia.org/wiki/GUI

is about user interaction like button, text edit, etc. It might use GDI.

The most well known (as far as I know) are QT and wxWidget:

http://qt.digia.com/
http://www.wxwidgets.org/

but there are more libraries like fltk:

http://www.fltk.org/index.php
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