Low ID clients connecting to a ZZUL client will be more fairly treated compared to how they are treated by the official client. If you are a low ID client, and it is your time to download from a remote client, you will not be able to download until your client connect to that remote eMule client the next time.
If the remote client is an official eMule client, it may be that you are not allowed to start download event when you next reconnect, even if your time to download has come.
If however, the remote client is a ZZUL eMule, you will alway be allowed connect. If you have waited longer (since it was decided that you should get to download the next time you reconnect) than the last of the fully connected clients, then you will downgrade that client to a trickle slot, and take its fully activated slot. If you have not waited that long, you will get a trickle slot, and will be kept connected for up to 3 minutes. If you are upgraded to a fully active client during that time, everything is ok, you have your slot.
If you are not upgraded to a fully active client during that time, you may be put back on queue, but you will be put in first place. This means, that the next time you reconnect (about 20-30 minutes later) you will have a greater chance of downgrading one of the already connected clients, and get a fully activated slot.
This behaviour gives equal opportunity for high and low ID clients. (Please note, that you will not be able to downgrade a client that wants a powershared file, unless you also want a powershared file).
Please posts questions about this feature in this thread.