When you double-click a row, Sonar can call out to a program defined in the HKEY_LOCAL_MACHINE\Software\Microsoft\FRSMon\SONAR\Expand registry value (REG_SZ), and will execute "program name" with the parameters "<local computer name> <domain name> <replica root> <column name>". The user can thus define what program actually is executed; for example, it could be Health_chk, or a Connstat report, and this can even be column-sensitive.