[Zope] use different versions of same product?

[John Hunter]

I would like to try and install the development version of WikiForNow
in parallel with my existing ZWiki.  Is it possible to use different
versions of a Product at the same time?

When I put ZWikiMaker.zexp in my import dir and try to import it, I
get a number of errors, the last of which is:

File /usr/local/Zope-2.3.0-src/./lib/python/App/ProductRegistry.py, line 131, in _manage_add_product_meta_type
    (Object: ApplicationDefaultPermissions)
Type Exists: (see above)

I take it the problem is that I already have registered ZWiki with a
previous version.  Is it possible to test drive new versions without
disabling the previous one?

John Hunter