The DC++-style tag

Notation

The following information is appended to the description field:
<++ V:x,M:x,H:x/y/z,S:x[,O:x]>
This is updated every 1-2 minutes if there are changes.
V(ersion)
x = client version
M(ode)
x = mode (A = Active, P = Passive, 5 = SOCKS5)
H(ubs)
x = number of hubs connected to where you're not a registered user
y = number of hubs you're registered in
z = number of hubs you're registered as an operator
S(lots)
x = number of upload slots you have open (note that they may be in use already)
O(pen an extra slot if speed is below)
x = if total upload is below this value DC++ will open another slot
This part of the tag is only shown when the option for it is enabled.

History

The DC++ tag was introduced back when the only available Direct Connect client was Neo-Modus DirectConnect (NMDC) v1.0. That particular client could only connect to one hub at a time, which ensured that the upload slots available were assigned to other users connected to that hub. At first, hub owners considered DC++ to be a cheat client, because it could connect to multiple hubs at once. The DC++ tag was introduced so hub owners could check if the users were connected to a reasonable amount of hubs and had enough upload slots available for sharing.
At this point, almost every client, whether it's capble of joining multiple hubs or not, has a similar tag in it's description field. The custom is to replace "++" with some other identifier uniquely identifying the client type (common are "oDC", "DCGUI" and "DC").