In the play I was in recently my character took a lot of notes. For the two boardroom scenes, Don Cisneros (one of the board of directors) was writing almost continuously. I now have about 20 pages of notes.
Writing on stage is kind of a strange thing. The audience can't read it so it doesn't matter exactly what you write (although there are a couple of places where it made sense for my character to be scribbling something out instead of writing). Several people asked me after the show just what it was I was writing. As a blog exclusive, I will now reveal this right here...
Actually, it's not really all that exciting. Mostly I was just writing some combination of random words from the dialogue of the other characters that could sort of be notes from the meeting. Occasionally I would write something moderately amusing (for example, when Jules said "Excuse me, but like my predecessor I should be the one who runs board meetings" I would often write "Thinks he runs board meetings") but I couldn't write anything too funny because then it would have been too hard to keep a straight face.