Many different ways. One way is to use one of the many wyUpdate commandline options: http://wyday.com/wybuild/help/wyupdate-commandline.php
Specifically -server and/or -updatepath.
Test update before going live
Once clients are live in the wild, how are you supposed to test a new update before pushing onto the live server?
Great, thank you. Command line options does the trick.
Appreciate the direction.