THEOS

Entry-Master Systems, Inc.
Makes access control, revenue control, and security management software. THEOS-based, integrated with Windows 3.x/95/98-NT/XP, has Web interface.
http://www.entry-master.com/

Freeware sources
Links to several requested THEOS programs.
http://www.theos-software.com/download/

Halliburton Systems Inc
Custom THEOS Programming
http://www.hsix.com

THEOS
Growing article, with links to many related topics. Wikipedia.
http://en.wikipedia.org/wiki/THEOS