Sharing Workbooks faster than 5 min
 

Hey.
I have a shared worksheet that is being edited on two computers. I know that
I can update changes every 5 minutes but is there anyway I could make that 1
minute or even less? It is crucial that the updates are done as close to real
time as they can be. I know I can have both users constantly saving but that
can be a pain if someone forgets to save.
Or is there a way I can have excel save after every change? Autorecover set
at 1 minute doesn't actually save the file, which means the changes aren't
updated.
Thanks!