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Roundup's use of ":name" for special variables breaks because Zope 
automagically strips those out of the form submission. 
 
Thus the cgi.client module would need replacing to remove the use of 
":name" variables. The HTML templates would also need editing to change 
their use of the ":name" variables. 
 
Or, Zope could be "fixed" to not strip those variables out, I suppose.