The following task opens Active Directory Users and Computers connected to any writeable domain controller.
Task Name: AD Users and Computers
Command: mmc.exe
Arguments: dsa.msc
Working Directory: %windir%\system32
This task opens Active Directory Users and Computers connected to the domain controller currently selected.
Task Name: AD Users and Computers using Host as DC
Command: mmc.exe
Arguments: dsa.msc /server=$Host$
Working Directory: %windir%\system32