An operating sub-system is an operating system running within the boundaries of another, providing similar functionality such as User Authentication, File Services, Message Services, and access to programs. These types of systems were known as BBS or Bulletin Board Systems throughout the late 1980's and 1990's. Telegard/2 is a project to re-implement the idea of a BBS as an operating subsystem through Java and JRuby, with modernized protocols, features, and capabilities.