The program using the LPT-port to selectively switch on/off up to 12 electrical devices. Devices can be managed by the following main ways: manually; using the five sensors; the contents of two text files f1 and f2; timer (schedule); from any computer of the local network, if you have installed the application LPTS_Client; remotely using the phone keypad, if the computer where you installed the program LPT_Switch have a 'voice' modem.