Multiple WMC instances can run at a time, all will be accessible to a client. Any UPnP AV client can be used to access WMC shared media. The client can query WMC for the list of files shared, the result of the query is formatted using XML.
Multiple instances of WMC can operate concurrently and be accessed by clients. Any UPnP AV client can access the shared media library of WMC. The client can request a list of files from WMC, which is returned in XML format.