Are User DSN's tied to User Profiles?

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http://serverfault.com – It seems obvious to me that User DSNs should carried along with a roaming User's Profiles, and when only a System DSN is set, that it will not be pulled along with the User's profile when they hop from work station to workstation. However, I don't know this for a fact, although it makes sense in my head. Is that the case, does have to be a particular kind of profile for this to occur? (HowTos)