As far as I can tell from here, UltraHal is written in Visual Basic (VB), and has functions that can be used in Visual Basic Script (VBS). The main Hal6.exe will listen to the selected *.uhp files when they say the right things.

Using this script you can create, write to and search database tables contained in the selected *.db file. You can access text manipulation functions to fix, change, dress up or cut down input and output sentences that Hal uses in conversation.

The main Hal script (which ever one you are using), has several places that you can make PlugIns insert themselves into the process. They are marked in REM statments and are positioned so as to allow access before and after main program functions like the one that fixes pronouns.

If you make your PlugIns right, they will slip in, do what you want and leave no trace if the user unchecks them some day.

Otherwise you can edit the main brain itself. Either by adding script, or deleting script, or changing script. This has the disadvantage of requiring you to re-edit it if you change your mind. Also if someone else wants to use your changes, they have to try to mess with their script.

The advantage is that straight editing is faster and easier.

I will be fixing these pages a little in preparation of ending my edits. I will continue to develop a Tutorial, bringing in the changes for version 6.1, but I won't post it until it is complete.