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what is the use of data.dm and constraint in each design directory?

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Hi all, 

    Normally when I try to "ls" a design directory I can always see these two files, both of which cannot be opened in a Virtuoso window (or even invisible for data.dm in the library manager). What is the meaning of them and how can I open them? I learned that opening "data.dm" deals with some skill scripts but I am not familiar with it. So could I get some step-to-step guidance to accomplish it? Also the constraint file is always locked by myself and it is annoying that I do not know what is the use of it, or if I can remove it brutally...

   PS: since the whole design environment is under a data synchronisation system, and I was told not to check in "data.dm" when I finish my work. Could I ask why?  Thanks again.

   PPS: my environment: virtuoso 6.1.6 in Linux.

Best regards,

Qilong


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