[1] Circuit Maintenance System

[2] Conversational Monitor System (in VM/CMS, IBM)

[3] Code Management System (DEC) Resource Control System

[4] Compiler Monitor System

[5] Computer Message Service (->"Lexikon der Text- und Datenkommunikation")

[6] Computerized Message Switching (St&F) (->"Lexikon der Text- und Datenkommunikation")

[7] Call Management System

[8] Communications Management Subsystem

[9] Content Management System/Service.