=> R0 = 0 to return the current menu tree state
1 report tree leading up to, but not including, a window/icon pair
R1 = buffer for result.
R2 = window handle of menu, if R0 = 1
R3 = icon handle of entry in menu, if R0 = 1
<= R0 = corrupted
R1 = filled buffer
If there are no errors the buffer is filled with a list of numbers in, same as the one you get after a menu selection.
This list returned will be null, ie. buffer+0 = -1, if;
if R0 = 1 and the Window/icon in R2/R3 is not in the tree, or
if R0 = 0 and the menu is owned by a different application, or has been closed
See PRM 3, page 222.
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