QUOTE (Blade @ Jul 19 2013, 01:12 PM)

The forgeries in that text might be the physical part. IIRC, the Forgery skill in SR4 was supposed to be used for making physical forgeries, everything else was done in the Matrix.
In that context, it would mean that you can create something that looks like an ID card, but it won't pass any check since it's not linked to any Matrix data. It might work in countries where paper documents are used and where Matrix coverage isn't very good.
As GM, I would also add ARO's to that. The way I imagine it is that you used to have to wear a physical ID badge in any secure facility. That is now an ARO tied to your commlink. So, as you walk around the halls of some secure lab, you'll be able to see everyone's "badge" in AR. I would rule that the Forgery skill also covers fabricating a convincing AR replica of said badge. Obviously, since it's a forgery, it won't stand up to any serious database check.
So, what use is it? That's where the team's decker comes in. He or she would have to monitor any possible Corporate SIN challenges in this case, and Spoof a Command to authorize the forged SIN.
This way, the forgery skill still works exactly as advertised, Fake SINs from the gear section still work as advertised (since they include false database entries, etc.), and the decker still has a role to play in helping smooth out the operation of the forged SIN.