Yes. Drill&Log is in the professional edition multiuser- and network enabled. Drill&Log uses the floating licenses (that means, you can install Drill&Log at any workstation in your network. The amount of the workstations, which are allowed to use the database simultaneous, is limited by your licence. The professional version of Drill&Log includes the licence for 2 simultaneous database accesses. Licences for more simultaneous accesses must be ordered seperately.
You can copy a drilling, if you first export the drilling and then import it again.
Drill&Log has a database transfer function.