Not knowing the capabilities of your laptop make this a guess at best. Without some sort of device to stream video I don't see a way to cruise the internet without wires. There is probably some device which provides that capability but I am not familiar with it. I know Apple makes the airport express but I think you need an Apple computer to stream to it from the laptop. The least complicated is to use S-Video in to the 990 for video and an OWA3 transmitting wirelessly to a stereo input on the 990. You could then use Dolby PL II to get a 5.1 signal out of the 990. You can also use the component video inputs to the 990 and the component monitor output from the 990 for video and either optical or digital coax to get the audio side. I am assuming that you are already using both DVI inputs to the 990 for other stuff. If not then you could use an HDMI output from your laptop to the DVI connection via adapter for the video. That would give you 1080P resolution capability. The easiest and probably best way is to invest in a newer BDP such as the Sony BDP-S590. It can be had for about $110 and can stream and play and Blurays. It will also play SACDs if you upgrade the 990 someday. If you want to spend some more $$$ the OPPO BDP-103 gives you 7.1 analog direct to the 990 and HDMI out to either the 990 or your TV. At $499 the BDP-103 is really a bargain considering what it does so well.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner
TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv
Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner