Light-Cone quantization of gauge theories

In this paper I shall discuss the problem of specifying the boundary conditions that must be used in the solution of light-cone constraint equations. The problem may be expressed as the specification of integration constant fields to be added to the commonly used solutions to these constraint equations. These integration constant fields are unphysical and nondynamical; but they affect the dynamics of physical fields and change the results of the calculations of measurable quantities. I shall illustrate these remarks with examples from QED and QCD.