The great news is that everything you need to develop GUI scripts is free, and readily available. Here is what you need:

1).You need the Reginald REXX interpreter.

2).You need the "REXX GUI" add-on DLL.

3).In order to create your GUI script, and initially test and debug it, you need the REXX Programmer Center IDE.

All of the above items are freeware, and you can download each one individually from the REXX User's web site.

The installation programs for the above will install and setup everything on your computer. It is recommended that you install them in the above order. But you can obtain new updates and install them in any order.

In order for someone else to be able to run your GUI script, he will need to install items 1 and 2 above (but not item 3, unless he wants to modify your script). Typically, you will create an installation utility that includes those 2 items and installs them along with your GUI script. This is discussed later.