Tcl is a scripting language used by UNIX programmers and systems administrators. Visual Tcl simplifies Tcl and Tk programming. This guide shows programmers with no previous X Windows experience how to grasp Visual Tcl and be able to write graphical programs using the language. The companion CD-ROM contains ports of Visual Tlc to the following UNIX platforms: SunOS 4.1.2 (for SPARC); HP HP-UX 9.0.1; Solaris 2.1 (for SPARC and for Intel); IBM AIX 3.2.5; SGI IRIX 5.0.2; Digital Unix 3.0 (for Alpha); SCO Open Desktop 3.0; SCO UnixWare 2.01; Sequent DYNIX/ptx 4.0.3.