directly without the data having to pass through any intermediary. This offers greater privacy and individuality than the client-server topology, but it is slower when a largenumber of users need to share data.In the illustrations, only three PCs are shown in the networks. But any LAN canhave as few as two, or as many as several dozen, PC workstations. Client-server LANsare favored by large institutions. Small businesses and schools, or departments within alarger corporation or university, prefer to use peer-to-peer LANs, mainly because theyare cheaper and easier to maintain.Wireless security systemsWireless technology lends itself to certain security applications, especially those in-volving mobile vehicles such as cars, boats, and trucks. Also, a wireless link can alertyou to a fire or intrusion at your home or business, when you are not physically pre-sent at the location.One well-known wireless security system for cars employs a device that trans-mits a radio signal when the vehicle is being improperly operated. The system cir-cuits and antenna are concealed, although there might be a warning sticker on the616 Wireless and personal communications systemsPCPCPC32-7A peer-to-peerwireless LAN.PCPCPCFile server32-6A client-server wireless LAN.