Server 2008 WinRM and WinRS explained
Windows Remote Management (WinRM) allows administrator to manage remote server via command line interface. The commands are sent remotely and executed locally on remote computer. On Server 2008 WinRM listen port 80 and 443 and uses /wsman URL. It is important to note that IIS role doesn’t need to be installed for WinRM to work.
For example, you want to access EX01 remotely. You can simply configure WinRM by running winrm quickconfig on EX01. Now, you can connect to EX01 remotely by running winrs –r:http://EX01.domain.com shutdown /r /t 1. Previous command restarts EX01 remotely.