Thanks also, jcl. However, I'm still a unclear as to the bottom line. It seems clear enough that if there's no reason to, don't stop Zorro. However, what if there is a (at least potential) reason? For example, my machine says it has "important" Windows updates to do. (Could be antivirus or whatever else...) Is there a recommended procedure?

a) Ignore Microsoft & don't do them ever.
b) Do them over the weekend after Zorro's logged out.
c) Do them over some night when trading's quiet.
d) Do them whenever's most convenient for you.
e) Other?

Thanks.