If you want to make your Powershell scripts infinitely powerful and flexible use variables!  For example, lets say you create a powershell script that manually shuts down some services in a specific order, then reboots the server, then manually starts some services in a specific order.  If at a minimum you use variables for the server and services name you can now take this script and apply it to any server in your environment!  Here is a link to the detailed information about variables in Powershell 2.0

http://technet.microsoft.com/en-us/library/dd347604.aspx

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