How do I configure a Cisco PIX 501 to allow a passthrough VPN to a RRAS using the ip address of the outside interface using the PDM?

We need to make a VPN that will go from the outside interface of our PIX and go directly to one particular server.  This way the remote user would be directed to one particular location on our network and he/she would not have access to other materials.   Correct me if I am wrong but from what I have read, my best guess would be to use PPTP to create a VPN tunnel from the remote user to the inside interface of the particular server.  If this is the case how would I do this configuration using the PDM?