http://myvstsblog.com/archive/2006/03/07/114.aspx
reference :http://msdn2.microsoft.com/en-us/library/ms253156(VS.80).aspx
Managing Remote Connections to Team Foundation Server Proxy
Team Foundation Server provides support for distributed teams to use source control through the Team Foundation Server Proxy. Team Foundation Server Proxy manages a cache of downloaded source control files in the location of the distributed team. Letting Team Foundation Server Proxy manage the downloading and caching of source files significantly reduces the bandwidth needed across wide area connections. By configuring the client to use Team Foundation Server Proxy, management of the files is transparent to the user. Any metadata exchange and file uploads continue to interface directly with the Team Foundation Server.
For more information about Team Foundation Server Proxy installation, see the Team Foundation Installation Guide available online at http://go.microsoft.com/fwlink/?linkid=40042.
In This Section
Team Foundation Server Proxy and Source Control
How to: Enable Source Control Caching for Team Foundation Server Proxy
How to: Change Cache Settings for Team Foundation Server Proxy
How to: Configure Cache Security for Team Foundation Server Proxy
How to: Disable Source Control Caching for Team Foundation Server
How to: Examine Cache Performance for Team Foundation Server Proxy