such as the proposed Secure Front End Processor was productized by Honeywell as SCOMP (Secure Communications Processor). In 1985 the US Department of Defense awarded STOP 2.1 an A1 security classification. The SCOMP and its STOP operating system eventually evolved via XTS-200 and XTS-300 into current XTS-400 offering of secure operating systems.

Honeywell continued system development until 1985. About 80 multimillion-dollar sites were installed, at universities, industry, and government sites. The French