It does.. I have mine setup that way. Once you have an account on dishnetwork.com you just select DISH Remote Access (which will prompt you to go to DRA or DISH Online, choose DRA). Click the "Preferences" tab, then click "receivers". There will be an option for "SlingBox/Receiver Settings". Click that, enter the "Finder ID" and which TV you want control of the receiver (TV1 may be your particular preference due to the Sling Box's IR blaster, I have not played with TV2 setting). Close the window and you should be all set!
Works lovely for me, BTW.