Question about prohibition against multiple clients

[Richard Cobbe <cobbe@xxxxxxxxxxx>]

I've just started using offlineimap v4.0.16, as packaged by Fink for OS X
10.4.  I'm impressed!  I'm really happy to be able to get away from my mail
client's built-in IMAP capabilities, which (when combined with lousy
network config by my ISP) aren't all that robust.

I do have one question, though.  In the man page, it says in the NOTES
section:

   MULTIPLE INSTANCES
       OfflineIMAP is not designed to have several instances (for instance,  a
       cron  job  and  an  interactive  invocation)  run over the same mailbox
       simultaneously.

I'm not quite sure what this means by "the same mailbox."  Is this
referring to the same maildir storage area, or is it broader than that?

I ask because I have two different computers, and I'd like to sync both
with the same account on the same IMAP server.  Is it safe to have one
instance of offlineimap running on each machine, pointed at the same IMAP
account?

Thanks,

Richard