Windows Processing 100%

I've noticed that if you craete a standard loop for an applications e.g.

While not KeyDown(KEY_ESCAPE)
......
Wend

In windows, its runs as fast as possible (i.e. Utilising available processing power 100%). I can see this is usesfull for games but is there a way of contolling this for desktop apps?

I've tried using PollSystem() inside the loop but it seems to have no affect.

use events.. that's how the native OS works..

Quick-and-dirty fix is to use delay:

delay 5

and CPU usage should drop to near 0. Larger delays should drop the CPU requirements even further, but the larger the number the longer it takes for the application to notice it when you do press a key as well.