I am not an active affiliate for any of the major networks (CJ, linkshare, shareasale, etc), so I am hoping you guys can answer this for me.

Do any of the networks allow their affiliates to join 'all' or multiple programs at once? Meaning can affiliates join and be accepted to all programs in the network at once or is individual program registration required?

My second question is whether the networks have a constant linking structure? Such as...

www.network.com/click.php?merchant=xxxx&aff=xxxx ?

Meaning do any of the networks have a constant clickthrough URL where only the merchant, affiliate and other values vary or do they all very in structure and contents?