From dictionary.com:
check off -v : put a check mark on or next to; “Please check each name on the list”; “tick off the items”

From my 40-year-old World Book Encyclopedia dictionary:
check off - to mark, especially on a list, as finished, acceptable, or requring no further attention.

“Checked off” is past tense of that phrase meaning that a check mark was placed next to the configuration item referenced in my original post.

Yes, I am wondering why avast! is not scanning my Azureus Bottorrent P2P sessions.