BookBarbarian
Expert Long Rester
I don't have computers at the gaming table (we play at a Uni club with no wifi access).
I put monster and npc stats on 150x100mm index cards in a box. At the beginning of encounters I pull out the cards I need and clip them to the gm screen or lay them flat on the table.
One of these days I'll get around to printing a stock of monster cards and spell cards. One of these days.