submitting writing samples with resumes

I recently came across a position that requested a writing sample to demonstrate one’s ability to convey technical information to non-technical folk. In a situation where there is no further information to go on, what do you submit? A copy of instructions you wrote up for your end users to connect to the OWA client? Installing a program? How to change the toner in a printer? Some write up explaining a majorly technical snafu with its equally technical resolution that kept the users from being able to work for three days? Also, would you include graphics (as you likely would when writing instructions for your end users)?

What would you submit?