Private Data Sessions

When you create a VPM Enterprise form based on the Form_Toolbar class (or a subclass), the form has a private data session by default. Generally, you want your forms to use private data sessions if you want multiple instances or if different forms can edit the same data at the same time.

DataSession: To turn off private data sessions for a form, set the DataSession property of the form to 1.

More:

Multiple Instances of Forms