Undo: Choosing Undo from the palette will sequentially remove bonds in reverse order ( ie. the last bond added will be the first to be removed).
Cut: The contents of the "Structure" window or the selected portion of the structure are cleared from the screen and placed in the Clipboard.
Copy: The contents of the "Structure" window or the selected portion of the structure are placed in the Clipboard.
Paste: The contents of the Clipboard are placed on the "Structure" window.
Clear: The contents of the "Structure" window or the selected portion of the structure are removed from the "Structure" window.
Quit: Exits the program (same as the identical menu item).
Calculate: (The return key is an equivalent). This command brings up a dialog box requesting the number of ‚àè electrons. Pressing the OK button or return key begins the calculation.