Manipulating Cameras

[IckyATLAS]

Is there a way to force the camera image on the screen, or it is mandatory that the player does hit an F12 key.

I have tried to activate and deactivate cameras so as to have one camera at a time active. But the image of the active camera does not appear if not hitting the F12 key.

There are many parameters in the camera (like Padlock) but the manual does not document them and I have no idea how to make them work.

Any advice is welcome.