Simple past tense and past participle of log.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "logged" in a sentence
"Cultivating loyal e-mail users is important because they tend to be frequent visitors and they often remain logged in when using other online services run by the e-mail providers."
"Keyboard clicks filled the room as Kevin logged on."
"Like so many, these romantic yearnings and unrequited needs/dreams are again logged into my aspiration file under, one day soon ..."