if you are using two different server, you can desactivate one and activate the other using the same licence, you have to copy all the .meta and .shared document for each document in the two server.
you cant test this and will be work oks
when you have one server active, and you active other server whit the same lince, automatic one is active and other is desactive
tell me if you need something else
Assuming that you have two different servers with two different Qlikview licences.
You can lease licence from any server.
Just open your qlikview desktop --> File menu --> open in server.
Enter url here for your second server where you have Named user cal available.
For details on how to lease license, look at the attached document.
To cluster the QlikView Server would be the best way.
At the task definition you can select that the QlikView application just available on a single cluster note.
You can restrict the reports to a group of users as well by configure you task.
if you are using the publisher, there are this task configuration possibilities as well available.