The DV models have two external FireWire IEEE 1394 ports. The features of the FireWire ports are:
The FireWire hardware and software provided with the iMac are capable of all asynchronous and isochronous transfers defined by IEEE standard 1394.
Developers of FireWire peripherals are required to provide device drivers. A driver for DV (digital video) is included in QuickTime 4, which comes installed on the iMac.
It is possible to connect two computers to each other using a FireWire cable, but no software is provided to make use of such a connection.