The Hessling Editor

How do I find out what really is to be executed?
If I type the command 'z', I get an error message.
I don't have a command 'z'. I don't have a macro 'z'.
'command z' gets the same error message. 'macro z' says no such macro.
'q synonym z' responds 'synonym z 1 z'. But what is z? I don't see it in the documentation.

Issue the command: q z
to get a hint.

Simple one to answer, "Z" is a synonym for the subCommand "Zone".