I would imagine the camera would connect via USB cable, if you check Sony UK site click here#
you will see a tab for Features click coonnectivity in window that pops up for a basic demo.
If your friend is using Win 98 I guess he'd have to install drivers.
(XP would probably recognise the camera without any drivers, it does my Fuji anyway.)
The camera probably came with a disc of software that would allow downloading of images to the PC under Win 98. If I remember correctly from my Windows 98 day It was Win98SE that had full USB support. But someone might correct my failing memory on that!.