This form allows you to enter a Rexx builtin function, with parameters, and obtain the result of that BIF.
The result returned is what an ANSI compliant Rexx interpreter should return. The result is produced by executing the actual Rexx code that defines the BIFs in the ANSI Standard.
No nesting of functions is allowed, and the following BIFs are not available:
STREAM LINES LINEIN LINEOUT CHARS CHARIN CHAROUT VALUE
BIF: eg. substr("fred",3)
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