R1 and R3 are model names.
There is HDP-R1, HDP-R3, HD2, Mini, etc. All Asus media player models.
R1 and R3 are essentially the same unit but the R3 has a multimedia card reader and a WiFi adapter embedded in it.
You can easily run any modded firmware on any unit with the exception of the Mini which seems to be a different hardware (maybe lower specced).
What Farvoice meant is that DLNA comes with the latest modded firmwares.
You can install a newer and modded firmware by searching for AMP r8 (the HD2 skin or the POHD skin).
http://moservices.org/forum/viewtopic.php?f=12&t=1030Both have the DLNA feature.
Don't forget that you need a proper bootcode in order to install AMP r8.
Search in that thread.
Then you can stream from your laptop with windows media player.
Hope that helps.
Cheers