Obviously you can't be truly in trance while engaging in other activities, but maintenance files, especially loops, can really help with the hypnosis experience/process, or even make you more susceptible for future sessions. It can also be a good substitute to true trance if you, like me, have a really hard time relaxing without proper distraction.
Specifically, I'm looking for video games to play, but tips and discussion about what, in general, is good for this are encouraged.