We discuss teaching applications of new personal computer (PC) and workstation programs for simulating dynamic systems and neural networks. DESIRE software permits truly interactive modeling without the usual annoying time delays imposed by FORTRAN compilation and linking. DESIRE/NEUNET brings similar convenience to the interactive design of systems which include neural networks. Neuron-layer interconnections are described in a readable matrix language. We introduce PC simulation under OS/2 and workstation programs for UNIX/OPEN WINDOWS, and dwell briefly on the impact of these new operating systems on educational simulation laboratories