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LS-ERROR describes a minimal yet powerfull approach to error handling in Lotus Script:

http://lserror.sourceforge.net/

Here is the downloadable source code:
http://downloads.sourceforge.net/lserror/lserror.lss

The library is in the public domain.

Here is an introduction:
http://lserror.sourceforge.net/documentation.html

and here is a reference of all public functions:
http://lserror.sourceforge.net/reference.html