When you join a domain you get a new user account/profile on the computer. All his data and settings will need to be transferred from the old local account to the new domain account. Once joined to the domain and logged onto the domain users can take the computers offsite and still log onto that same account, the domain does not have to be contacted for logins while offsite., a local account is not needed for offsite use but the previous local accounts will still exist on the laptop. That account if its not going to be used should be disabled for security though.
Now there are tools and a procedure to move a local account to a domain account if you want to give that shot, doesn't always work, and I've never needed to use it. ForensiT User Profile Wizard supposedly works well: http://www.forensit.com/downloads.html
Definitely have a backup in place first.
Now there are tools and a procedure to move a local account to a domain account if you want to give that shot, doesn't always work, and I've never needed to use it. ForensiT User Profile Wizard supposedly works well: http://www.forensit.com/downloads.html
Definitely have a backup in place first.