Most new PCs, specially those meant for multimedia do have a DV (i-Link/Firewire) Audio/Video signal port for video capture from vcams.
No they don't unless they are very new. You will have to purchase a firewire card for your PC.
No. It's not like the USB that you will see on every new computer. However, many do have ieee (DV) connector. Many desktops labeled Media Centers have them. You can buy a card to put into your desktop, they are around $30. I have a thinkpad T61 that has it built-in. To answer you question. No
DVI or Digital Visual Interface was introduced in 1999. They are found on all flat panels monitors and TV's ,DVD players , Data projectors, and cable set top boxes. Shortly after its introduction, it rapidly became the industry standard for digital interfaces. DVI supports high bandwidth Digital content Protection HDCP. During the transition phase from analog to digital, most monitors and displays came with both a DVI and A VGA connector. The DVI connections accept both formats by using a DVD-A plug or a DVD-D plug for the respective format. Single link DVI supports resolution up to 1920 by 1080 at 60 hertz. For higher resolutions a dual DVI configuration is deployed, which can provide for resolution as high as 2560 x 1600 at 85 hertz.
