Using the two additional Beam Position Monitors (BPM's) found on either side of one of the Interaction Points (the so-called Collision Point Monitors), one can determine, in principle, the single-turn matrix for one BPM location or the other and, hence, the lattice functions at that location. Once the amplitude function and its slope at one BPM is found, it is straight forward to compute the amplitude function through the collision hall and the location of its minimum, and the value of the function at the collision point.