Sharing cookies between vB and custom mods.

[BSMedia]

I have a custom developed addon for vBulletin that currently ties into the user table so users are able to enter their current username and passwords into the application login form to log themselves in and edit the information this modification contains.

One small problem we are having is, that users have to login both at the forums and the modification. Is there any easy way to share the cookie between them, or another way so users won't have to login twice