Caster deals with the angle of the kingpins at the front of the car. 0 degrees caster would have the kingpin straight up and down relative to the front suspension arm. The more caster you add, the top of the kingpin is moved further back in the suspension.
If point "x" in the diagram is the front of the car:
Negative Caster (not possible in current Xray TC's)
x \
Positive Caster
x /
As you add more caster, the car will generally be less aggressive in the middle of the corner, but more aggressive on initial turn in and corner exit.
Outboard toe when used in the rear will generally provide more rotation from the back end than just inboard toe. If you ran 2 degrees of inboard toe and 1 degree of outboard toe, your car would rotate better through the middle of the corner than if you ran simply 3 degrees of inboard toe.
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