My AT100 with v3.1 can use the embedded Toshiba Media Player to stream some video types from my Win7 Home Edition PC, but the PC can't see the AT100 as an attached device over WiFi. As the AT100 is certified DLNA compliant (I know that 'compliant' doesn't necessarily mean 'fully compliant in all aspects') I would expect to see the AT100 in the devices view of Win7 like my WDTVLive media player is displayed.
I use a TV tuner card in the PC to record free to air programs for time shifting purposes which Win7 saves as .wtv file types. Neither the AT100 nor the WDTVLive can play this file type when pulling the stream from the PC. I can however push the .wtv files using the 'Play To' function to the WDTVLive to watch. I cannot 'play to' the AT100 because Win7 doesn't recognize the AT100 as an attached device.
In Win7 WPM there is a window that shows all the devices on the network and allows streaming permissions to be set individually for each device. I can find the AT100 in this list as an unidentified device, by matching the MAC address reported.
I connected the AT100 by USB and Win7 loaded a driver, this gave me the new ability using WiFi on the AT100 to control streaming of files from the PC to the WDTVLive. The PC, however still refuses to recognize the AT100 in its device management windows.
Cannot say anything about the DLNA but as far as I know the preinstalled Toshiba Media Player on A100 supports different mod and one of the mods is calling DMP (digital media player).
Choosing this mode allows you to connect to the PC or notebook with preinstalled Windows Media Player 12. But this works only under Win 7! This will allow to stream the video files.