Although most libraries with client/ server systems use regular PCs or fat clients, a limited number use intelligent terminals known as thin clients. A thin client differs from a dumb terminal in that it has memory, but differs from a PC in that it has no disk storage. The typical thin client is comparable with a 200 MHz PC running Windows 95.
Libraries using thin clients adopted the technology to save costs. The thin client devices themselves cost only $200 less than a robust fat client such as a 600 MHz PC, but they are less expensive to support. PCs must be configured with software and require ongoing support to keep that software current and to undo the effects of user tampering. When a thin client device has to be replaced, libraries need only pull out the old and plug in the new. They don't have to reinstall software. A technician can handle only 50 to 75 PCs, but well over twice that many thin clients.
Thin clients also are a benefit because viruses can't attack them since they have no direct Internet access, If a virus is downloaded, the server usually blocks it.
Libraries should analyze their needs before committing to thin clients. Although thin clients may be suitable for access to the patron access catalog and some staff applications, many of the devices access many different electronic sources of information. Choose each workstation based on demand for use. Devices dedicated to quick lookup in the patron access catalog or charge/ discharge of library materials can be thin clients, but fat clients better serve Internet users by having a PC capable of accessing graphics-rich sites and downloading and manipulating the data.
The libraries experiencing the greatest success with thin clients use a carefully planned mix of fat and thin clients.
Thin clients can be used with many automated library systems, but the vendors—such as Gaylord and Innovative Interfaces—that have promoted the idea have the most clients and experience. The former uses Microsoft's Terminal Server product on the clients. Innovative uses Java extensively.
