You can use Active Directory Users and Computers to double-check that a computer was successfully added.

You can set Logon Time for Users in Active Directory for security purposes to regulate logon sessions. This will prevent you from signing in at any time.

Want to know how to set permissions in Active Directory for users? Using GPMC or AD for computers and users are the best methods.

Adam walks through how to proactively monitor an AD group for changes and execute a PowerShell script to take action when that happens.