From OpenSCADAWiki
The messages request form contains the configuration fields of the request and the table of results. Configuration fields of the request are:
- Time, depth and level — specifies the request time, depth and minimum level of messages (more or equal).
- Category pattern — specifies the category of the requested messages. In the category you can specify the elements of selection by template, that is the characters '*' — for any string and '?' — for any character, as well as a regular expression enclosed between the symbols '/' (/mod_(System|LogicLev)/).
- Archivers — indicates the messages archivers (separated by symbol ';'), for which the request is to be processed. If the value is missing, the request will be processed for the buffer and all archivers. If "<buffer>" is specified then the request will be processed for the messages buffer.