Adobe Acrobat 7 Professional - Manual (Page 216)

Positioning form fields with grids
You can use grids to help position form fields at precise points on a page. The grid lines
do not get printed. You can define the grid spacing, color, and position of a grid. You can
also choose whether to have the boundaries of a form field snap to grid lines when you are
editing the form field. (See
Viewing grids .)