Windows Update Agent, download new Windows Update files.

      wuauclt Options


   /a or /ResetAuthorization  Initiate an asynchronous background search for applicable updates.
                              If Automatic Updates are disabled, this has no effect.

   /r or /ReportNow           Send all queued reporting events to the server asynchronously.

   /DetectNow                 Initiate detection right away, Query the WSUS server immediately 
                              to see if any new updates are needed.

WSUS uses a cookie on client computers to store computer group membership when client-side targeting is used. By default this cookie expires an hour after WSUS creates it. If you are using client-side targeting and change group membership, use /ResetAuthorization /detectnow to expire the cookie, initiate detection, and have WSUS update computer group membership.


C:\> wuauclt /a /DetectNow

C:\> wuauclt /r /DetectNow

“We must always change, renew, rejuvenate ourselves; otherwise we harden” ~ Johann Wolfgang von Goethe


wuauserv - The Windows Update Service

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