The 'RESET MODE' allows to restore the previous tree topology
after using the 'ROTATE', 'LENGTH', and 'MOVE MODE' pressing
The left, middle, or right mouse buttons respectively.
Click on the 'RESET' button to activate the 'RESET MODE'.
NOTES
Short descriptions of the 'MODE' and the functions assigned
to the mouse buttons are given in the fourth line of the
'ARB_NT' window.
EXAMPLES
None
WARNINGS
!!! Only the most recent previous topology can be restored!!!