Sony PCG-F420 Primary User Manual page 43

The preinstalled Smart Connect software allows you to use an i.LINK
cable (not supplied) to connect your VAIO notebook to another VAIO
computer that also has Smart Connect. You can then use one computer to
copy, delete, and edit files on the other computer. You can also print from
a printer attached to either computer.
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See the Smart Connect online help for more information.
i.LINK cables compatible with your VAIO notebook include cables with
the following part numbers: VMC-IL4415 (a 1.5-meter cable with a 4-pin
connector at each end), VMC-IL4615 (a 1.5 meter-cable with a 4-pin
connector at one end and a 6-pin connector at the other), and
VMC-IL4408A (a 0.8-meter cable with a 4-pin connector at each end).