630ec8b7_Appendix_D__X_Config_Options__Equipment
[Value] 4 [Equipment] 
TwinView clone mode stereo (aka "passive" stereo). On video cards that support TwinView, the left eye is displayed on the first display, and the right eye is displayed on the second display. This is normally used in conjunction with special projectors to produce 2 polarized images which are then viewed with polarized glasses. To use this stereo mode, you must also configure TwinView in clone mode with the same resolution, panning offset, and panning domains on each display.
Appendix D. X Config Options
Equipment