This may be because I'm a tech and always looking to impress my PC using friends, but I carry a decent complement of cables with me at all times. The bag of course is essential, and I make sure to keep a firewire cable, an Ethernet cable, modem cable, the power supply obviously, the video adapters, a stack of blank CDs, a small optical two button scroll wheel mouse with a retractable cord and that's mostly it. All that plus the built in bluetooth and wifi = connectivity to almost anything in any situation, and a way to get data to anybody on any platform.
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