The last show I worked on (a crazy devised theater piece with a lot of cues), I was ASMing, so I was backstage, while the SM was in the booth. She would dictate notes to me over headset ("Geoff, take a note...", "Hey Geoff, did you get the note that..."), and I also took a lot of my own notes. After the performance, I would just hand her a stack of post-its and she would pass them on accordingly. Then, again...we kind of read each others mind sometimes and many time, I'd end up handing her a similar note to one that she scribbled down between cues. It seemed to work well, we got through the production alive, at least.