How does one get mapped into dbo?  By giving them system administrative rights only?

If I were to enter dbo into the "User" part of the login maps, would that mean...

I dont' feel that these answers really answer what I'm getting at:

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Ok, now, my problem is as such.  We have clients that are moving away from dbo, and creating their...

I still haven't gotten a GOOD explanation as to what dbo is.  It is not a user.  It is not a role.  What is it??

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Once a login has been mapped to dbo in your database, no other logins can be mapped to dbo in same database.

I'm really not sure what you are referring to over...