Limit what the account can logon to an hours accessed
In Active Directory find a user by selecting action > find an new window will popup where you can search for users
once you have selected the user go into the account tab you will see two buttons "Logon hours" and "Log on to"
Logon hours: select the hours a user can access computers
log on to: set the user to only be allowed to logon to a certain computer(s)
Log On To Button
when selecting "Log on to" under computer name add the device name of the pc or whatever your naming scheme is and hit add, now user should only be able to logon that one pc