Hardware or software to help with tremor-- suggestions needed

Hello, my dad is trying to use an intel imac, and he's having a lot of trouble, partly due to a tremor that makes it difficult to manipulate the mouse and keyboard. Does anyone know of any solutions to such a problem? I would think there might be a mouse or trackball and a keyboard that are designed to help, or perhaps a software solution for a shaky mouse, but I thought I'd throw the question out there to see what can be found.
Like it or not, many of us will be facing this problem eventually, and I'm learning that the mac requires more dexterity than the average 85-year-old has.

There occurred to me that I should have mentioned that I am assuming that you are using the trackpad and keyboard of the Mac Book which I can understand your Dad really disliking. My suggestion is that you blow a few bucks and get the extra keyboard and trackball as a present for your dad and plug it into the Mac Book USB port. You might also find it handy to hook up a monitor (20" or so). It will be so much easier to read the larger screen. You might also be aware that with mouse, keyboard and display hooked up you can close the lid on the Mac Book and the display will look a bit better not having to share the video processor with the Mac Book display.
The other thing I would mention is that it might be wise to download one of the programs that make an audible click through the speaker with each keyclick, mouse click and scroll wheel turn. I use a little Preference Pane called "Keyclick" which gives you many options on how you want it to sound (I make my keyboard sound like an old fashioned typewriter - which is a sound your Dad would be quite familiar with!) With this installed, your Dad will have much more feedback and it will make typing and mousing much easier for him.
Griff

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