In this sample configuration, four different kinds of clients connect and encrypt traffic with the Cisco Secure PIX Firewall as tunnel endpoint:
Users that run Cisco Secure VPN Client 1.1 on Microsoft Windows 95/98/NT
Users that run the Cisco Secure VPN 3000 Client 2.5.x on Windows 95/98/NT
Users that run native Windows 98/2000/XP Point-to-Point Tunneling Protocol (PPTP) clients
Users that run the Cisco VPN Client 3.x/4.x on Windows 95/98/NT/2000/XP
In this example, a single pool for IPsec and PPTP is configured. However, the pools can also be made separate.
http://www.cisco.com/warp/public/110/pptpcrypto3.html