Hello everyone -
Well, I was able to change the screen-resolution and returning to the original screen-res., but the problem is the display-frequency !
How can I read the current screen-size and frequency (e.g. 1024x768, 75 Hz), then change it to another resolution (e.g. 800x600 60Hz), and then, when exiting the program, change back to the original resolution and frequency (1024x768, 75Hz) ?

Any help would be greatl appreciated ! Thx !