Inter-Client Communication Conventions Manual
Standard protocol for the X Window System / From Wikipedia, the free encyclopedia
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In computing, the Inter-Client Communication Conventions Manual (ICCCM or I39L short for "I", 39 letters and "L")[1] is a standard protocol for the X Window System. It specifies conventions for clients of a common X server about selections and cut buffers, communication with the window manager and session manager, manipulation of shared resources, and color characterization.