Make a list of the most important parts. Once again, take this opportunity to answer any questions that employees might have about working with a disabled co-worker. People who will be working with the applicant will be more comfortable if they know a few basics. For example, don't pet or distract guide dogs. It's OK to ask if a disabled person wants help.
Most offices have one person who seems to know how everything works.
It is usually a person who likes to help others. Spend a little extra time with that person as he or she will probably take the applicant underwing. During this phase it is important to start with what sort of access technology is available for the systems that this company uses. There are many access products out there, but chances are the list can be narrowed down by finding out which products will work in the company environment. Most often vendors of access technology know whether their product will work correctly in a given environment.