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6.9. Semi-standards

     A set of extensions that stems from the VM/CMS operating
     system. Basically, this includes the most common extensions
     in the VM/CMS version of REXX, in addition of some functions
     that perform task normally done with commands under VM/CMS.

     A set of interface functions to the VMS operating system.
     Basically, this makes the REXX programming under VMS as
     powerful as programming directly in DCL.

     A set of interface functionality to the Unix operating
     system.  Basically, this includes some functions that are
     normally called as commands when programming Unix shell
     scripts. Although it is possible to call these as commands in
     Regina, there are considerable speed improvements in
     implementing them as built-in functions.