(1) (Society for Information Management, Chicago, IL, www.simnet.org) Founded in 1968 as the Society for MIS, it is a membership organization made up of corporate and division heads of IT organizations. SIM provides a forum for exchange of technical information and offers educational and research programs, competitions and awards. Its annual SIMposium is a high-level strategic "think tank" event.

(2) (Subscriber Identity Module) A smart card inserted into GSM phones that contains your telephone account information. It lets you use a borrowed or rented GSM phone as if it were your own. SIM cards can also be programmed to display custom menus on the phone's readout. See SIM lock and GSM.

(3) (Simple Instant Messenger) An open source IM client program that interfaces with many of the popular instant messenger services. For more information, visit http://sim-im.berlios.de. See instant messaging.