Remember, the execution is halted at sendPageAndWait(), so nothing is really "running" at that point. Only when <map:call continuation=""/> is called, will the execution resume.
If the user clicks on a different link and "loses" the continuation ID, the continuation will still be around (i.e. it can be restarted), until it expires and is cleaned up after a while by the ContinuationsManager.
If you managed to keep track of the continuation IDs, the user could even switch back and forth between the loops.
I think the question is more about memory consumption. Isn't it?
Arthur
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