>a little question,how to rigister system-wide hot key in VFP?

In addition to the others, you can declare RegisterHotKey() function from inside a VFP application:
http://www.news2news.com/vfp/?group=-1&function=726

But now - turning to your name - Xcloud BitBoy .... anything you can with the group would be most appreciated (even if it's not Friday)!:-)