Is CVSzilla the only integration between CVS and Bugzilla?

[Patrick Lam]

Dear all:
 
I am just wondering if CVSzilla is the only tool that allows integration
between CVS and Bugzilla?
 
According to Bugzilla's documentation, 
 
"available integration with automated software configuration management
systems, including Perforce and CVS (through the Bugzilla email
interface and checkin/checkout scripts)"
 
But I cannot find any description about how to implement that.  Any
pointers please?
 
Thanks very much in advance.
 
Patrick
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