Dual Display and SLI

If one has two nVidia video cards in SLI with one output port per card, can two visual output devices be supported?

If one has two nVidia video cards in SLI with two output ports per card, can four visual output devices be supported?

Hereafter please post replies here.

i think that only 1 card can output and the otherone just sits there

correct me if im wrong id like to know