Client application to control access to untrusted networks?

[louder () hotmail com]

Hello,I am just looking to see if anyone can provide any experiences and/or recommendations of software to be installed 
on clients that is "location aware" and can enforce certain ACL's or network policies. i.e. Symantec, McAfee, Cisco?

My scenario and what I am trying to do is with my users laptops, currently we do not allow them to connect to any 
public wireless networks. Ofcourse this is something that I am being pressured on allowing. We would like to be able to 
force a VPN client to load as soon as the mobile device running Windows XP connects to a public "hot spot" and if the 
VPN connection fails to disconnect the system from that network. It would be an IPSEC VPN from either Cisco or Juniper. 

Thank you!

Brandon L.

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