>In my application I have a number of forms the user can call. The user can call multiple instance of a form but I would like one of them not to have this feature.
>
>Which property do I need to use to prevent the user from opening multiple instance of my form ?

I have a custom property that you set.
Try putting:

IF WEXIST( This.Name )

In your form load, then display a message and kill the form if it is true.

j