Hello,

I'm an authorized representative of iTwin and I have answers to your two questions.

1. Do you ever have to reattach the two iTwin pieces?

Answer: No, once the special code has been generated between the two iTwins you can disconnect your half and reconnect with no problems. The only time you might want to reconnect the two halves is in the eventuality you want to generate a new key code between the two halves or to generate a new disable code.

2. Are the two halves constantly in sync?

Answer: They're constantly in sync as long as they are each plugged into computers that are powered on.

I hope that helps!