Ok, I am in the present situation:

Zen 4 IR5 with the pre-release IR6 agents (Hot Patch 27). I am buying a
new server and want to put Netware 6.5 OES on it with Zen 6.5.

Can Zen 4 and 6.5 co-exist temporarily while I make the move? Or do I
have to turn it off before installing Zen 6.5?

Anyone done an upgrade this way and can share any gotchas or things to
do to make it smooth?