my preferred choice is: give the password to the users and let them login. when the session is over reset the password (if that is a local password, then reset it with a deploy task or something like that).
alternative solution is an action:
- set relevant registry key for autologon (https://technet.microsoft.com/en-us/library/ee872306.aspx)
- reboot machines
- upon reboot clear the above mentioned keys
possible issue: if screen saver is active and password is requested to unlock then you have to enter password manually on each machine (that's why my preferred choice is the first one).
