/For=ForVolumeSpec|/On=OnVolumeSpec - Displays all shadow copy storage associations on the system. To list all associations ...

%1 %2 [/For=ForVolumeSpec|/On=OnVolumeSpec]     - Displays all shadow copy storage associations on the system.         To list all associations for a given volume, specify a      ForVolumeSpec and no /On option.  To list all associations on a given      volume, specify an OnVolumeSpec and no /For option.      Example Usage: vssadmin List ShadowStorage /On=C: