You can see what licenses have been installed under 4D Server by selecting "Update License..." (Cmd-U) on the server machine. The resulting dialog contains a list of all serial numbers present, with disclosure triangles down the left side to expand each serial number and see what it contains. The main serial number entry for 4D Server will contain sub-entries for expansion serial numbers that can also be twisted open to reveal their contents. Note that the serial number for 4D Server includes two client licenses, even though they are not listed separately in the license dialog box.