Apple Remote Desktop add new computer

Hi anybody has some sample about how to add new computer (having only IP) to a ARD List?
Something like

tell application "Remote Desktop"
	add computer {Internet address:""} to computer list "Temp"
end tell

Running the above script, a new computer is added in the existing list but with another IP (!!!).

I would like, starting from a txt file of IP populate a ARD list.
Another approach should be to generate XML and import it after.
Any suggestion?