Here's a bunch of screenshots from the Java version of CALCView. The Windows version is very similar.

Interactive editing of CALCA, CALC, LOGIC, and MATH blocks in a simulated or online environment.

Easy to test different paths through the code (The current path taken is shown by the green dots)

Full support for CALCA, CALC, MATH, and LOGIC Blocks. A configuration view allows you to view/edit all of the parameters.

You can set I/O Bad, Out Of Service, and in Error and watch how the path through the code changes.

Preferences screen allows you to configure the program for Solaris and NT systems.

Supports Copy and Paste for easy editing.