Hello mbuttman,
You can get a list of the DSNs registered with the system by using LabVIEW's registry key VIs and reading the following keys.
For User DSN:
HKEY_CURRENT_USER\Software\ODBC\ODBC.INI\ODBC Data Sources
For System:
HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI\ODBC Data Sources
Please let me know if you have any questions.
Regards,
Matt F