Release
Files that have Release priority will be uploaded a 100% of the time if there are clients trying to download them. It doesn't matter how many other files you share or download.
This makes it possible for you to release files efficiently and still download files normally.
If the files with Release priority don't use all of the bandwidth, shared files with non-release priority are uploaded. This means that you won't have to unshare everything that you are not shareing with Release priorty.
This gives more sources for files on the network and makes sure the allotted upload bandwidth are always used a 100% efficiently to release your files.
In eMule this corresponds to the PowerShare priority for shared files but, unlike some eMule mods, it will not stop any upload to any other client to start an upload of the "released" file (the client requesting the file will have to wait for some upload to end).