Here's an example of an ir.config file that was converted to support an 'L' shaped 2-screen Holobench.
# Configuration file for a 2-pipe system driving a 2
# screened Bench - one pipe drives two projectors (i.e. channels)
#
# Specify here which display walls you want to run and
# in which graphics pipe
Walls screen0 screen1
# Display information for walls (pipe # & (optional)
# window geometry)
WallDisplay screen1 :1.0 1280x1024+0+0
WallDisplay screen0 :1.0 1280x1024+0+1024
# The corners of the screens in the CAVELib
# coordinate system
ProjectionData screen0 * wall -90 90 -110 -90 200 -110 90 90 -110 cm
ProjectionData screen1 * wall 90 90 -110 90 90 0 -90 90 -110 cm
DisplayMode stereo
StereoBuffer y
# Type of tracking
TrackerType daemon
controllerType daemon
# Cave units for GL coordinates (Meters or feet)
# This needs to be set for how the application is written
Units Meters
# Whether to hide the cursor when in the CAVE windows
HideCursor y