Thanks for the sample.

Kev
>Kevin,
>Here's some sample code(very simple):
>Declare Integer FindWindow in Win32API Integer,String
>wclass=0
>winname="Microsoft Visual Foxpro"
>apphand=FindWindow(wclass ,winname)
>IF apphand=0
> * no other instances found
>>Hi
>>
>>I need an app to only be run once at one time.
>>
>>What's the best way to detect if a VFP app is already running ?
>>
>>Thanks
>>Kev