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Line 15: [[Category:File managers]] POP used the substitution parameters of 'procedures' (see OCL) to form usable working 'canned code' to preform tasks when working with the System/34. Rather than type: // Load $copy,f1........ you choose from a list called 'copy file'. and filled in the blanks. It was a shortcut in coding OCL (operation control language). This utility that was sold/distributed by IBM was the most highly used but most seldom bought utility program that IBM ever made. It could accept OCL and assembler language perhaps COBOL also instructions to make life easy as a programmer on the systems/34.

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