(1) Short for Systems Management Server, a set of tools from Microsoft that assists in managing PCs connected to a local-area network (LAN). SMS enables a network administrator to create an inventory of all the hardware and software on the network and to store it in an SMS database. Using this database, SMS can then perform software distribution and installation over the LAN. SMS also enables a network administrator to perform diagnostic tests on PCs attached to the LAN.
(2) Short for Short Message Service Similar to paging, SMS is a service for sending short text messages to mobile phones.