Sorry guys, I've been out of the office for a couple of days so I have only
just caught up with your continuing dilema.

You are right, the version of Windows you are using does matter if you are
going to use the method of using digital signatures that I suggested earlier.
I have had no problems within my own team using Windows NT4 and XP. The only
difficulties I have experienced was with an external chap who was using '98.
It's a pity really because it's a great solution if you have the right
technology ... sorry!