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    REFERENCE TO BUILT-IN AND REXXSUPPORT.LIBRARY FUNCTIONS
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This section presents a reference to  built-in functions  and to the
functions included in  rexxsupport.library .

Each node begins with a template that shows the format of the arguments
accepted by the function. The following conventions are used:

   <>    A word or term surrounded by angle brackets should be replaced by
         an expression. Any form of expression that returns a value of the
         proper type may be used in place of this item. The replacement is
         often a  variable , but it could also be a literal value, an
          operation , or another function  call .

         The names used for the items in each template are included as
         mnemonic devices -- terms that may help the user remember what
         each expression stands for. They are not otherwise significant.

         Each term is explained in more detail in the note following the
         template.

   []    Items enclosed in square brackets are optional. They may be
         excluded when the function is called, but the commas that
         separate optional items are significant. If only the second of
         two optional items is included, a comma must still be used as a
         placeholder for the omitted item as it is in the following:

            SHOW('P',,'0a'x)

   {}    Items enclosed in curly braces and entered in uppercase are
         literal values. The expression used for such an argument must
         return one of the values from the list.

   |     A bar is used to separate a list of literal values within {}
         braces.

   <UC>  UPPERCASE characters are used to indicate literal values that may
         be used as argument. The value may be entered in upper or
         lowercase when the instruction is actually used. Only the first
         letter of the option need be included. The value may be entered
         as any type of  expression .

   >>>   Three angle-braces are used in examples to indicate what the
         example would output if run from a shell. Those braces and the
         following text is not part of the code and should not be
         entered if the example is used.

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