EXECUTE CHANNEL PROGRAM
\ˈɛksɪkjˌuːt t͡ʃˈanə͡l pɹˈə͡ʊɡɹam], \ˈɛksɪkjˌuːt tʃˈanəl pɹˈəʊɡɹam], \ˈɛ_k_s_ɪ_k_j_ˌuː_t tʃ_ˈa_n_əl p_ɹ_ˈəʊ_ɡ_ɹ_a_m]\
Definitions of EXECUTE CHANNEL PROGRAM
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(EXCP) An IBM system for low-level fileaccess, where the programmer is completely responsible forproviding a list of device-specific "channel comands" to beexecuted by I/O channels, control units and/or devices.The operating system will simply check the "CCW" chainsfor security purposes (access invalid memory or outside offile extents) and then schedule them for execution.
By Denis Howe