Pronounced "Dash A," this is the shorthand for the administrative login granted by Tier 2. If your username was 'alf1226,' your -a would be 'alf1226-a'. Each account would have a different password and different permissions.
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"In order to modify objects in Active Directory, you must open 'Active Directory Users and Computers' with your -a by right clicking on the application and clicking 'Run as administrator.'"
"Sorry, you can't modify the DNS settings of this computer until you get your -a. You jut need to shadow for another week and Alex will give you it."