MACROMEDIA FIREWORKS 2-USING FIREWORKS Use Manual page 38

Number of undo steps
Choose File > Undo to reverse an action. Enter a value of
up to 100 in the General > "Undo Steps" preference field.
RAM requirements increase as the number of undo
steps increases.
Note: Changes to the Undo preference do not take
effect until Fireworks is restarted.
Unit of measurement
Define canvas size using pixels, inches, or centimeters in
the New Document dialog box. The unit you choose
appears in the Info panel. Change the unit using the
Info panel's Options pop-up.
Note: Regardless of the document's unit of
measurement, rulers always display in pixels.
Rulers
To show or hide rulers, choose View > Rulers. To set the
ruler' s zero point, click and drag the zero-point marker
from the upper-left corner of the document window to a
new location. The zero point represents the intersection
of the horizontal and vertical rulers. Double-click the
zero point marker to reset the zero point to its
default position.
38 Chapter 1
Grid
The grid is a non-exporting background of horizontal
and vertical lines. Choose View > Grid to display the
grid. With View > Snap to Grid checked, dragging an
object near a grid line causes that object to snap to
the grid.
Set grid color.
Set horizontal
grid spacing.
Set vertical
grid spacing.