HP C4788x User Manual page 11

Note The user can select the available stapler action through the printer driver
(for example, 1 staple or 2 staples). When selecting any stapler action, the
jobs or mopies are automatically separated by offsetting the jobs or mopies
from each other. If the proper printer driver is not used, the default stapler
action occurs.
Default stapler actions (HP 3000-sheet Stapler/Stacker ONLY)
No Staple
Using the Device
If the default action is set to No Staple, the job is not
stapled.
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