Layer output as source for 2nd layer

[digital:snot]

is it possible to specify the output of one layer to be a source input of another layer?

the final effect being that in a 1280x480 comp (2 640x480 outputs) (2 layers total- left screen and right screen):

i can switch videos on the left screen, simultaneously have the output of the left be sent to the right screen where I have flipped the image so it is a mirror of left screen.

[edwin]

no this is not possible, but if this is the only thing you need it for there are some other solutions.
1 - use 1 composition of 640x480 and send it to two beamers, let the second beamer flip it in hardware, almost any beamer supports a flip.
2 - load the same clips in two layers, flip the second layer and trigger the clips by triggering the columns.

[HerrNieDa]

you can also try some effects like iterate, mirror and the xyz parameters from the clip itself and from the layer! (clip effects don't behaves like layer or comp effects)

[cat]

Trouble with flipping a projector is that you might want it unflipped for other things too, you might want to treat a triple head as seperate outs, mirrored outsides, or one image spanning, all in one gig. my 2c...