Tvheadend

hello,
I just installed TVH and have noticed the DVR stream url is numbered the same as a channel id. So when I play from a client, I end up receiving the live tv channel. see below:

dvr url (of already recorded TV program):
http://<server ip>:9981/stream/channelid//2

tv channel 2 (sbs radio 2):
http://<server ip>:9981/stream/channelid//2

am I missing something simple here? I expected the dvr streaming of recorded tv to have a unique stream number from the live channels. Any help would be great.
thanks
michael

p.s am impressed so far, but a little way to go.