You can have up to 16 LCD displays in the same computer, showing different (or the same) information in each displays.
The displays are of 16 columns for 2 lines (rows). The driver accept the international ASCII code.
The connection is really easy, just plugin into RS-232 (like mouse ) interface. All PC have this, so you not need nothing more.
Really this devices are suitable for general purpose, but was originally designed like complement of ANT4. Into public telephony stores the ANT4 work showing to the customers the cost of the call.