Which metaschema tables can be populated for custom use?

Are there any metaschema fields that can be used to store internal application information?
Can application specific information such as the startup program name (typically for batch processing) be stored in the database metaschema to query later?
Where can we store specific internal notes to read for the database or the application schema?

Historically the _User-Misc character field was added to the schema tables expressly for the purpose of Customers being able to store their own information as required:

• The _User-Misc field is one of the fields that will not be used by Progress in future releases.
• Schema traps do not prevent writing to these *._User-Misc fields
• In general, database metaschema tables should never be written to because the compatibility of the contents of these metaschema tables from one major release of Progress to another cannot be guaranteed. The _User-Misc field is the one exception.

In OpenEdge 11.7 more user modifiable VST fields were added:

• _MyConnection._Myconn-UserMisc
• _Connect._Connect-UserMisc
• _Cdc-Change-Tracking._User-Misc