The Workstation Preferences Editor : Lockout Tab

Lockout Tab
Administrative lockout is a global setting that affects all virtual machines and teams for all users on a host computer. It allows you to impose any combination of the following restrictions:
 
Note 
If no administrative lockout preferences have been set, any user can set them and set a password for access to the administrative lockout features. If any user has already set administrative lockout preferences, you must know the password in order to change the settings.
Removing a Forgotten Password
If you cannot remember the password and want to remove it, you must uninstall Workstation, as described in the Workstation User’s Manual. Be sure to click Yes when asked if you want to remove the administrative lockout settings. After you reinstall Workstation, you can enable the administrative lockout features again and set a new password.