[ic] Restarting Interchange when site live

[John1]

Is it safe to restart the Interchange daemon while a site is live and while
a customer may potentially be in the middle of the order process.

i.e.  Is all the session data stored on disk, and would the customer be able
to complete their order where they left off, if the site were unavailable
for say 10 seconds in the middle of their order?

If I wanted catalog changes to be applied to a live site would I be better
just sending an "Apply changes" command rather than actually restarting the
daemon.  Would this have any adverse effects on a customer halfway through
placing an order?

Thanks,

John