XOPEN #ch, fspec, mode, flags

This is equivalent to the traditional OPEN statement for ISAM files, except:

•   XOPEN eliminates the implicit connection between the fstat and recno variables normally specified in the OPEN, and the file access statements. The recno and fstat parameters are eliminated.

•   XOPEN allows for the various flags (WAIT'RECORD, WAIT'FILE, END'FILE,...) which must normally be specified as literals to the compiler to instead be evaluated at runtime.

The values for flags are:

* These are the literal file OPEN modifiers that can be tacked on to the end of an ISAMA OPEN statement.

NOTE: this is the dividing line between ALL CAPS LARGE and ALL CAPS SMALL ("Symbol" style)