[Zope] Asynchronous triggering of events

[Brian Sullivan]

I am back working with Zope 2.9.1 (yes I know it is long in the tooth
but I am trying to avoid adding the pain of upgrading, having products
fail and all the usually comes with upgrading if I can). I

 am looking for a strategy to schedule and carry out tasks at periodic
future dates.

I had a look at Xron (http://www.zope.org/Members/lstaffor/Xron/) but
it either doesn't seem to work with 2.9.1 (or I can't get it to work).
I install it in the products directory but it doesn't show up in the
product directory when Zope restarts and naturally none of the objects
it is supposed to supply can be added. I haven't investigated what the
problem is (and am not even totally sure how to go about it). Is there
something isn't obvious that I might be missing?

Barring getting it to work are there any other alternatives?