Jenna Fischer is finally revealing what she was typing in all those scenes on The Office .

While Fischers character, receptionist Pam Beesly, appeared to be working hard in the background of various episodes, the actor shared that she was actually chatting with her co-stars on AOL Instant Messenger.

John Krasinski went around to our computers and set up instant message, Fischer said on the Office Ladies podcast , which she co-hosts with fellow Office star Angela Kinsey . When we got the internet, he did this so that we could joke around in the background of scenes ... and I got to work one day, and he was like, Check it out.

The NBC sitcom famously chronicled the hilarious mundanities of working at the fictional paper company Dunder Mifflin. While its unclear whether Krasinski who played Pams love interest Jim Halpert chose everyone elses screen name, he certainly picked Fischers.

The actor recalled him showing her the little instant message screen only to find out she had been dubbed receptionitis15. Kinsey, who played conservative accountant Angela Martin in the show, added that the cast was pretty particular about their names.

I remember that he talked us through, the rest of us, how to do it, Kinsey said on the podcast, adding that she picked MSaccountant as her screen name. We were so tickled that we could now IM each other during scenes. We really kept on theme for our characters.

Eagle-eyed fans of the show have long noted that Rainn Wilson chose MonkeyTrainer for his screen name, that is, at least for his private chats with Martin who went by Monkey. Some of the actors also started branching out, however, and went on to message actual fans online.