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Wait-Event - Powershell 3.0 CmdLet

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Short description
Waits until a particular event is raised before continuing to run.

Wait-Event [[-SourceIdentifier] <String>] [-Timeout <Int32>] [<CommonParameters>]

The Wait-Event cmdlet suspends execution of a script or function until a particular event is raised. Execution resumes 
when the event is detected. To cancel the wait, press CTRL+C.

This feature provides an alternative to polling for an event. It also allows you to determine the response to an event 
in two different ways: by using the Action parameter of the event subscription and by waiting for an event to return an
d then respond with an action.