Thanks for the tip!!

>You can do it with FindWindow API call. Tale a look to UT Knowledgebase,
>here you'll find all necessary information.
>
>
>>Is there a way to only allow one instance of an application to be
>executed on a workstation. I'm using a table right now that holds user
>information and if the user is logged on, I populate a logical field to
>.T., but this has obvious problems when users don't escape the application
>in a normal fashion, or the computer crashes leaving the field still
>reporting a .T. value. Thanks!