Abstract
A Fortran computer program to solve Poisson's equation in two dimensions using linear boundary elements and bilinear interior triangles is presented. The program is suitable for usage on a typical microcomputer designed to be easily modified or extended and to serve as an introduction to programming boundary element algorithms. Emphasis is placed upon program modularity and naming conventions to elucidate the mathematical formulation and corresponding coding aspects of the boundary element method and to allow for modification or experimentation.