1. A method of enabling a user to utilize a computer program in a data processing system to control the propagation of a given data input through successive, clocked digital logic units of a pipeline logic system comprising a plurality of pipeline stages and to observe said propagation of said data input through said logic units, comprising the steps of: a. said user creating an ASCII file which specifies selection and display-positioning parameters for information representing at least one internal logic state of said logic system, which file comprises additional parameters which define which portions of said logic units correspond to which pipeline stages of said logic system; b. said user providing a command to process said file; and c. said data processing system displaying said information to said user.