Here is what you need:

1).You need the Reginald REXX interpreter.

2).You need the RxMidiIO package.

You can download the above items from the REXX User's web site. Someone wishing to run a script you write will also need to install the above 2 items.

Note: If you need only to input or output MIDI data through the computer's MIDI ports, but otherwise do not need to store nor retrieve the data from a MIDI File Format file on disk, then you do not need to also install "REXX MIDI" (RXMIDI.DLL).