>Hi,
>
>Thanks mike for your help, it work with vfp 6.0 not 7.0. any suggest

Try this:

Declare Integer FindWindow In WIN32API Integer, String @
winname=Version() && or titlebar caption of whatever you're looking for
apphand= FindWindow(0, @winname)
*If the call was successful, stop processing.
If apphand<>0
	?"Application is already running"
Endif