Change tracking in LyX and multiple users

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Hi,

I want to track changes in LyX in the same way that I do with my  
computer programs in C++, and for that purpose I use CVS. I look at  
the mail list but did not found relevant information about this.

How do you generally track the changes in your documents ? what do you  
think is the best system ? Do you recommend CVS or another one ?

By the way, my objective is also to have several users working on the  
same LyX document at the same time. What do you think is the best  
approach ?

Thanks

Horacio