(1) A secure Web server from Sentinel Systems, formerly Bodacion Technologies, Barrington, IL (www.bodacion.com). Sentinel is a wholly owned company of the Centuria Corporation, www.centuria.us.

HYDRA is a virus-proof, hacker-proof PowerPC-based system that uses a proprietary operating system kernel for running Java servlets and JSPs. Applications programmed in the company's own Genesis language can be compiled on Windows and Unix workstations and then uploaded. As an extra step in foiling hackers who insert bogus packets into the data stream, HYDRA includes software that generates extremely random numbers called "Bodacions." Applications can use Bodacions to generate numbers such as account numbers, session IDs and TCP sequence numbers.

(2) (Hydra) The code name for Windows Terminal Server. See Windows Terminal Server.

(3) (HYbrid Document Reproduction Apparatus) A printer, photocopier, scanner and fax built into one machine.

(4) (Hydra) A device that converts analog signals to ISDN Basic Rate Interface (BRI).