Hello JacobBruce!
A lot of functions available in pdScript from Precision is registered by this interpreter and are not part of the general RemObjects PascalScript engine.
Functions like ShowMessage, InputBox, etc are listed in pdScript Help Reference under "Standard functions", because they are standard from Delphi developer's point of view.
Simply register these functions you want to use in your application (in an OnCompile event assigned to TPSScript component). If you need more info (ie. code example), feel free to contact us via e-mail (support@be-precision.com)
Best regards,
Roman Macura
Precision software & consulting