The XTS-400's a multi-level secure computer operating system. It's multi-user and multitasking. It works in networked environments and supports Gigabit Ethernet and both IPv4 and IPv6. The XTS-400's a combination of Intel x86 hardware and the "STOP" (for Secure Trusted Operating Program) operating system. XTS-400 was developed by BAE Systems, and was originally released as version 6.0 in December of 2003. STOP provides "high-assurance" security and, as of July 18, 2006,'s the only general-purpo… (More on Xts-400)