Help with Matsuura v710 w/ Yasnac 2000G control

I've got the task of setting up an old Matsuura V710 milling machine
with a 2000G and 14" CRT (circa 1981), and have a couple questions.
Sorry, no manual, so that's why I'm asking here.

1) Setting work offset B
I can set the first work offset by finding the X, Y and Z
coordinates, then pressing ORG for each axis.
But how do I set Offset B??? On the screen page, it looks something
like this:
Offset B G49 X .0 H00
G49 Y .0 H00
G49 Z .0 H00
G49 A .0 H00
I have no idea what keys to press to set values in here, and no idea
how to call it in a program. Can anyone help?? How does G49 work??

2) What are the Z Axis lockout switch, MST lock, and Manual ABS
switches??

3) can the control handle comments, like some fanucs that can read
into the machine comments, but have no way of inserting a comment?

Nothing too complicated, drill and tap, maybe thread milling, and
pocket milling, and plain steel and some stainless.

Thanks,
samurai

.

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