When I run
commands /p enable
I am presented with ENABLE.

What is ENABLE used for?

I was thinking this is used with the ACTIVATE command, but not sure why it is listed as a command. Typing ENABLE followed by enter does nothing that I can see.

COMMANDS also presents a LOOKUPERRORS command, of which the only reference I can find in the help file is via the search, that is, for "Version 22".

The LOOKUPERRORS command launches the Tools->Lookup Errors dialog.

Should this be added to the help file, with its own help page?

Note that the WHICH command says they are both internal commands.
e:\utils>which lookuperrors
lookuperrors is an internal command

e:\utils>which enable
enable is an internal command

     _x64: 1
   _admin: 1
_elevated: 1

TCC  27.00.16 x64   Windows 10 [Version 10.0.18363.1198]
LOOKUPERRORS is intended for use by Take Command and the IDE (through the menu); it's not particularly useful from the TCC command line. It's already covered in the help for those menu entries.

ENABLE is used internally by TCC; it shouldn't have appeared in the commands list & I have removed it for the next build.