TSF (PN)~ A device-independent language-neutral and extensible system that enables natural language services and advanced text input on the desktop and within applications. TSID string (n)~ A string that specifies the transmitter subscriber ID sent by the fax machine when sending a fax to a receiving machine. This string is usually a combination of the fax or telephone number and the name of the business. It is often the same as the called subscriber ID.