The ENTER statement provides a means of allowing the use of more than one language in the same program.
The ENTER statement is classed as an obsolete element in the ANSI'85 standard
and is scheduled to be deleted from the next full revision of the ANSI Standard.
All dialects in this COBOL implementation support this syntax for documentation
purposes only. The FLAGSTD Compiler directive can be used to detect all occurrences
of this syntax.
Although it is a part of the standard COBOL definition, this feature is
explicitly excluded from the X/Open COBOL language definitions and should
not be used in an X/Open COBOL conforming source program.