1) District 75 is the largest urban public school district for students with severe disabilities in the world, educating over 22,000 students across New York City. Over 6,500 students are on the autistic spectrum. 2) The document discusses various accessibility features of Mac OS X and the iPad to help students with vision, hearing, physical/motor, and learning disabilities. It provides examples of features like screen magnification, voiceover, adjustable mouse sensitivity, and text-to-speech. 3) The iPad offers apps to help with communication, reading/writing, cause and effect, autism support, and more. External switches and keyboards can also provide alternative access methods.