Cisco VPN client to connect to CheckPoint server?

I've got Cisco VPN client and CheckPoint VPN-1 SecureClient in the same PC.

I'd like to "combine" these two clients into one.  Anyone knows how to make Cisco VPN client work with CheckPoint server?  Or vice-versa (ie CheckPoint Client with Cisco Firewall/VPN Cencentrator)?

The CheckPoint VPN connection is based on certificate.  Importing the certificate into Cisco VPN client doesn't pose any problem.  But I'm unable to make Cisco's work.  Anyone has any idea?