You might start at
http://www.outlookcode.com/d/forms.htm
A form never has recipients. An Outlook form is a UI/code template. What has recipients is a message created from a custom form? (And custom message forms are, in general, a bad idea, useful in only narrow circumstances, as discussed in this forum at least once a week.) For such a message, the user either enters the recipients manually as with standard messages or the VBScript code behind the form sets them programmatically.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers