Windows PowerShell Fast Start: A Quick Start Guide for Windows PowerShell

Windows PowerShell provides three levels of Help documentation: standard, detailed, and full. If you want to view the standard Help documentation for a specific cmdlet, type get-help followed by the cmdlet name, such as:
get-help new-variable
The standard Help documentation provides the complete syntax for using a cmdlet, which includes details on any parameters the cmdlet supports and examples. By adding the –Detailed parameter, you can get detailed information about a cmdlet. Or you can get full technical information about a cmdlet by adding the –Full parameter.