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The Shared Variable facility is roughly analagous to a Windows out-of-process server today.
When APL\360 was first introduced in 1968, there were no built-in means by which a user could import data from outside of the APL system. Some of the timesharing vendors began offering an external file system at the time, however IBM's approach was to supply a more generic facility whereby an external process could be used by an APL program. Following APL.SV, the IBM VS APL and APL2 program products also supported shared variables, as well as the [[IBM 5100]] line of computers.
Shared Variable Processors were available to allow APL access to the following:<br />
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