File | New
Create a new simulation file.
File | Open
Open an existing simulation file.
File | Save
Save the current simulation.
File | Save As
Save as the current simulation
File | Quit
Terminate the program. You will be
given the chance to save any unsaved changes.
If there are numbered simulation files, these are recently opened files. Choosing one of them will cause it to be opened and to become the current simulation.