MUP "Multiple Unc Provider, MUP" resource locator
The basic task of MUP is to determine which network provider specifically to meet a UNC request. To make this decision, MUP needs to send UNC names (in parallel ways) mentioned in the request (such as "Microsoft Network User"). If a network provider indicates that it is possible to provide the service involved in the UNC name, MUP will send the remaining parts in the request to it. If there are multiple providers to represent a UNC request, MUP will select the most appropriate provider according to the priority.
Priority: / HKEY_LOCAL_MACHINE / SYETEM / CURRENTCONTROLSET / CONTROL / NETWORKPROVIDER / ORDER