Most recent mother boards will have a AGP slot by recent prolly last five years, even ones with on board graphics.
AGP just means advanced graphics port,
If you look inside your machine the white slots are PCI the AGP slot is slightly shorter brown and set back from the PCI slot, a much shorter brown slot will be for a particular type of modem, a riser slot I think its called.
Incidently TV OUT and video capture cards come in AGP, in fact PCI graphic video cards are almost obsolete now, not even sure if you could buy one anywhere but a puter fair now.
You can have a graphic card in the PCI slot and one in the AGP slot and run two monitors at the same time, or you can get a AGP graphic card that runs two different monitors by itself.
If there are black slots in your machine dont worry these are the old ISA slots,generaly concidered obsolete now, but your board may be old enought to have ISA ,PCI and AGP slots.
Try not to get hooked on upgrading , Drapes usta upgrade graphic cards,CPU's mother boards and stuff almost on a monthly basis monthly once, Drapes took the cure and don't read the tecky sites now to avoid a relapse.
