Programming Errors (e.g. attempting to define a duplicate Verb Name, using
a non-existent Verb Group etc.), normally give rise to an error message and
(on a VAX) the call frame stack is unwound to indicate where the error
occurred. The Error Reporting Level may be adjusted by the Application Program,
so as to inhibit the signalling of errors.
All Subprograms are callable as integer functions, where the function
value is the UIPACK error code as specified in Appendix C. These error codes are
specified by Parameter Files that should be ``Included" in the relevant
program sections. These files are described in Appendix B.