192.168.?.??:9000. Change question marks to your box ip and put in address bar
I think this is what your after
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No you don't need additional software. You just type the IP address of your box in to the browser with port 9000 on the end and it will display.. if it's not working then either OSCAM isn't running or you've changed the port it's running on.
Standard port on ATV oscam is :83 have you tried that?
To find port use filezilla and navigate to the USR/Keys folder, look for oscam_atv, open it and look in oscam.conf....view/edit, then look for this data
[webif]
httpport = 9000
with 9000 being the port on my setup.