I've read the section on "Deductions for
Home Computers", and the "Office-in-Home Deduction"
series. Excellent. My particular situation is
almost covered by these articles, but not quite.
I think I have pieced together an answer from the
different examples given.

I do home visits at a Physical Therapist. I make
my appointments mostly from home, and use our home
computer to produce my assessments, reports, etc.
Most days I do not go to the office (not required, as
long as I am producing enough hours on the home
visits). I have a desk at the office, and access
to a shared computer. However, many of my days allow
me no time to go to the office, and so I simply go
from my last visit to home, and complete my write-ups
there at night. On Fridays I spend most of my day at home doing write-ups I was not able to complete during the week (the office is 32 miles away!).

Can I claim the percentage I use the computer
for work-related activities as a deduction?

Thanks in advance.