Here are some Quest commands working with Active Directory :
Get-QADComputer Retrieve computer objects that match specified conditions.
Connect-QADService Connect to AD domain controller (or AD LDS)
Disconnect-QADService Disconnect from an AD domain controller
Get-QADGroup Retrieve groups that match specific conditions
Set-QADGroup Modify attributes of group(s)
New-QADGroup Create a new workgroup
Get-QADGroupMember Retrieve members of a group
Add-QADGroupMember Add one or more objects to a group
Remove-QADGroupMember Remove one or more members from a group
Get-QADMemberOf Retrieve group memberships of a particular object
Get-QADUser Retrieve users that match specific conditions
Set-QADUser Modify attributes of a user account
New-QADUser Create a new user account
Enable-QADUser Enable a user account
Move-QADObject Move an object to a new OU
Remove-QADObject Delete object(s) from Active Directory
Rename-QADObject Rename an object in Active Directory
Disable-QADUser Disable a user account
Unlock-QADUser Unlock a user account
Deprovision-QADUser Deprovision a user account in AD