I think I know what you are asking.
Is it simply, how to use different views?
If so, then here goes:
Press "Page Up" to use on board cameras such as T-cam, there are nine in total, just keep pressing "Page Up"
Press "Page Down" to use a chase view from behind the car
Press "Delete" to use the opposite view from the front of the car
Press "Insert" to have the TV view where an automatic director chooses cameras and the car to watch
Press up and down arrows to change which car to watch
Press left for external cameras, stationary cameras which follow a car
Press Right to go back to the cockpit view
Press "home" to go back to your own car
I can't remember if "end" does anything but you could try.
You also said you couldnt get replays:
It should be a case of pressing space, to pause the game, and then pressing the "R" key (r for replay)
Hope this is what you are looking for.
Bazza