$chat(N)
dcc chats
$send(N)
dcc sends
$get(N)
dcc gets
In case you want the window names (in order to manipulate windows with the /window command), these are:
Chat <nick/IP>
dcc chats
Send <nick> <filename>
dcc sends
Get <nick> <filename>
dcc gets
You can also access dcc chat windows with =<nickname>, for example:
/window -n =qwerty