[Skunkworks] Windows server CALs

To the Windows server geeks: Tafadhali explain in laymans' terms the whole business of CALs. Scenario: a Windows server running SQL server and another application. The application is to be accessed by 10 users over the network. A MFP will connect to the server via the network. Also running on the server are AD, anti-virus/firewall and backup sotware. Now, someone pls explain what/who requires a CAL in this case. //MotoBaridi