File request
From AMule Project FAQ
A file request is a call to some remote client to ask for a file.
If you are not on that client's upload queue, you will be added for that file (have in mind that any client can only request for one to any remote client). If the client supports reporting the queue position of a reuquest, it will do so. If the remote client's queue si already full, it will tell your client "Queue full".
If you were already on the remote client's queue then it will answer the queue position your request is in (if the client supports this feature).