Function keys are short cuts:

Function keys provide a quick way to begin certain
frequent activities that are also available from the
menus.  For example, you may start capturing network
frames by pressing F10, or you may select "Capture" via
the menus.  They are equivalent and the choice is
yours.

Function key identifiers may appear and disappear:

A function key identifier will appear at the bottom of
the screen only if starting that activity is resonable
at the moment.  (This is not true for the menu entries
they represent, which are always present so that you
can see all possibilities.)  For example, F3, "Data
Display," is seen only when there are data in the
capture buffer available for display.

Function keys may change:

The significance of some of the function keys changes
depending on the current context.  For example,  F4
permits you to Zoom In on a window when there are
multiple windows on the screen, and to Zoom Out when
you wish to return to the multiple window view.

Some keys take on a different significance during
"Capture."  F6, for example, selects Capture Options
while capturing, and Display Options during display
operations.

Function key shortcuts:

You may press the number keys (1 through 0) instead of
the function keys (F1 through F10) if you prefer.

