You can have a look at this website
It's got utility's called: Anykey34.exe or anykeyutility.exe, but they are aimed for DOS. I have no idea whether that kind of hardware is still supported.
Luckily for you a user of the keyboard posted how he uses it:
My second keyboard is an old Gateway
AnyKey keyboard with it's own built-in
macro functions and onboard memory.
It's plugged into a regular PS2. I'm
using this as a controller or command
sequencer for Reaper.
The Gateway AnyKey keyboard lets you
program a sequence of keystrokes into
any key; that sequence is then played
back when the key is pressed. Because
this functionality is self-contained
in the kb, the computer needs no
awareness that the incoming sequence
is programmed -- it just receives it
as regular input (though at a very
high speed) and responds accordingly.
For example, I want to quickly toggle
the mute on all my vocal tracks. I
program a key on the AnyKey to send a
sequence that uses the SWS ReaConsole
command to do this:
cm*vo*[ENTER]
When I press this key, the sequence is
sent, which "manually" opens the
console [c], specifies the mute action
[m], specifies that it should apply to
all tracks with vo anywhere in their
name [vo], and then sends the Enter
key. It all happens in a fraction of a
second.
I can program this into any key that I
want, eg, the F1 key, and use the F2
key to unmute all vo tracks, by
adding a hyphen in front of the same
command sequence.
Because the AnyKey kb's
programmability is self-contained, it
has no effect at all on my main
keyboard, whose F1 and F2 keys do what
they're supposed to do -- there is no
duplication of those keys.
Now, all of the regular keys on the
AnyKey kb can be programed in this
way, BUT -- and this is important and
the key to how this works -- all keys
that are NOT specifically programmed
will behave normally, and will be seen
by the OS as regular kb input. In
other words, unprogrammed keys are
"duplicates" but keys that ARE
programmed are not.
As mentioned, the AnyKey's
programmability is entirely
self-contained, so even though Windows
sees a second duplicate keyboard, the
keyboard itself is capable of sending
out alternate sequences. The problem
with this is that the AnyKey is old,
and it's memory is limited and, sadly,
not as strong as it once was.
