It will either just not do that or you'll need a VPN ROUTER and a WAP.
I have a laptop (WinXP Pro) that can access a VPN only when hard wired to my router (Netgear MR814v2). However it will not connect to the VPN when I try to access it through the wireless feature of the same router.
I also have a problem with another laptop, a Mac iBook, where I can print through my desktop PC through a program called GhostScript... But only when I'm connected to the same router by a wire. Again, I can't do it wirelessly.