Demonstration of Interactive Lisp

This is a demo that runs Gnu Common Lisp (GCL) interactively.

When the demo is started, a window and a command menu are created. Click in the input area and type an expression, such as (+ 2 3) .

You must have the Java virtual machine installed to run this demo; you can get it for Windows (msjavx86.exe) here.

The best things in life are free: this demo uses the free software Gnu Common Lisp (GCL), XGCL, X windows [see also XFree86], Java, and WeirdX, a Java implementation of an X server.


  1. If needed, edit your display name. It should end in :2.0, for example,
  2. Click to start the demo. Scroll down to see the interaction window.

This server runs Gnu Common Lisp (GCL) interactively.

Click the mouse inside the box, then type in a Lisp expression, followed by Enter/Return. Repeat as desired.

Gordon S. Novak Jr.