Conversational Programming System or CPS is an early time-sharing system, originally developed by Allen-Babcock and offered by IBM, which runs on System/360 mainframes circa 1967 through 1972 in a partition of OS/360 Release 17 MFT II or MVT or above. CPS is implemented as an interpreter, and users can select either a rudimentary form of BASIC or a reasonably complete version of PL/I. A third option provides remote job entry (RJE) features allowing users to submit JCL job streams for batch processing. A fourth option is called control mode. Normally, only the system operator would be permitted to use control mode. The available features in control mode include:Send a message to an individual user or all users. Clobber a specific user's interpreter environment. Monitor the activity of an individual user. Terminate the entire CPS system.