JJ,

No idea either. There doesn't seem to be any official documentation
about it or the other semicolon and comma delimiters.

Bummer.

For example, I found that the "" character when not used for redirection,
is treated as (no quotes) "?.". And the "" character when not used for
redirection, is treated as (no quotes) "*.". At least for DIR command.

Whut ? What good does that do (duplicating already existing functionality)
?

Its nice to be used for obsfucation though (like entering IPv4 adresses as a
single, 32-bit number).

Regards,
Rudy Wieser