If you want to work for your administrative login or account and do certain installation or task, the Run As command eliminated the need to log off and log on the administrator desktop.
If you are logged on as limited account you can run a program as a different user or administrator by typing
runas.exe /user:[username] path at the command prompt.
For more details:
RUNAS [ [/noprofile | /profile] [/env] [/savecred | /netonly] ]
RUNAS [ [/noprofile | /profile] [/env] [/savecred] ]
RUNAS /trustlevel:<TrustLevel> program
/noprofile specifies that the user's profile should not be loaded.
NOTE: Enter user's password only when prompted.
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