I have a ViewSonic 22" at 1680 x 1050 with the TM1.6 mod.
For the above screen using the dimensions 25 -900, as indicated in the previous posts, at the [G3F I
237] line,
positions the scrolling text menu at the bottom 'sitting' on the command bar and up against the rightmost command tab. Essentially bottom-middle of the screen. I hope this helps other ViewSonic owners.
For general info the left number (25) moves the menu left as you decrease the value, the right number (-900) moves the menu down as you decrease the value.
Thanks for the info gents.