The Collection licenses are not 1 (of this) + 1 (of something else). It's one multi-purpose license.
How they are accessed depends on what the are. If this the old, individual perpetual license they need to get a home use license. If this is the individual desktop/rental model then they only need internet connection and sign in with an appropriate ID. If this is a network/multiuser license, they can borrow the license for a limited time via a temporary VPN connection.