Type          : 4
 Name          : Goto menu after clearing menu stack
 Optional Data : <Menu Name> [Password] [/F=<File Area>|+|-]
                 [/M=<Message Area>|+|-]

   As for function 1,  but  before jumping to the new menu, the
   gosub menu stack is cleared.  Obviously you can't use a type
   3 return straight after this!