Adobe Acrobat 7 Professional - Manual (Page 222)

Making Adobe PDF forms accessible
You can make your form fields accessible to vision- and motion-challenged users by
adding tags to the PDF file and by properly structuring it. (See
Making existing Adobe
PDF documents accessible .) In addition, you can use the Tooltip form field property to
provide the user with information about the field or to provide instructions; for example,
using the Tooltip property's value, the screen reader could say "Your name." Without the
Tooltip property, a screen reader simply names the type of form field.
To add instructional information to a form field:
1. Do one of the following to open the form field's Properties window:
●
Double-click a selected form field.
●
Click the More button on the Properties toolbar.
2. In the General tab, type instructional text into the Tooltip box.