Letting another webpage use same loginvars

[C.44]

Hi, i got a little question, i'm currently messing around a little with VBB and another site on the same server. I have a test user with a simple password.

Now i'm wanting to give some users permission to post newsmessages on the site, which is something like a frontpage for VBB.

Problem is, i'm not really a fan of a double login system (one for VBB and one for the site). So i was wondering if there is any way i could combine these, to use VBB's encrypted password system.

I have searched the forum, and found that the password can't be decrypted 'cause of the MD5 encryption algorythm. But how the does the forum check if you are using the right pwd ? Just by encrypting your pwd and check if it's the same as the one in the DB ?

Please help me with this