At least one of the 3rd-party Crystal Reports viewers listed at http://kenhamady.com/bookmarks.html allows the user to select a different ODBC DSN on the fly. This can be done either through the GUI or via a command line argument. The GUI can expose either all DSN's on that machine for the user's choice or a restricted choice of DSNs that are within the same "group" of DSNs as the original report DSN.
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