beastie.4th language ?

[michelbh at gol.com]

Hi,

My question might seem basic. Nevertheless I didn't find the answer on
the net. Excuse me in case I did look seriously enough, which might
afterall, be the case.

The files under the /boot directory on FreeBSD : beastie.4th and the
included ones screen.4th and frames.4th are obviously written in a
certain scripting language.

What is this language ?
Can I get a turorial for this scripting language ?
Or even a reference manual ?

Any URL or suggestion would be appreciated.

Thanks in advance.

Michel