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The [[Inter-process communication]] (IPC) is primarily based on the "request" and "respond" messaging foundation that enhanced the Enterprise Application Integration among services for both internal and external environments. Thus CTOS was well known for the message-based Micro-Kernel Architecture. Applications are added as services to the main server. Each client consumes the services via its own mailbox called "exchange" and well-published message formats. The communication works on "request codes" that are owned by the service. The operating system maintains the exchanges, message queues, scheduling, control, message passing, etc., while the service manages the messages at its own exchange using "wait", "check", and "respond" macros.
CTOS ran on [[Intel]] [[x86]] computers, and could run concurrently with [[Windows NT]] on [[Unisys
The system API was presented to both high-level languages and assembly language.
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