Some programs have been removed to speed up project loading time and protect the privacy of the end user. Third-party programs are downloaded with the '/download' command and installed with Si-PI, which automatically starts when the .si file is clicked. Why you must download and install programs - Programs from the Internet are in compressed form, and when you download them through OS-CMD they are saved in the uncompiled .si format. To use these programs, they must first be unzipped, compiled and then extracted to your system by Si-PI.
Si-OS stands for Scratch Integrated Operating System. The Ghost Game was sourced from the book 'Computer Coding for Kids' and it was originally written in Python 3.3.3.