ControlMaster is a new feature in OpenSSH v 4.x, that allows it to reuse an existing connection to a remote host when opening new connections to that host
"Using this feature you can increase performance as it result into the reduced connection times that the ControlMaster feature provides are particularly nice when you're using tools that open multiple SSH connections to do work on a remote server..." Read more...
On a related note, here's a short guide on reusing existing OpenSSH v4 connections written by steve.
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