A way to control PD’s settings from within a patch, using “internal messages”
I’m a noob in PD, but as I could understand it, internal messages are messages that you can send to Pure Data from within a patch, and these messages can act on the program itself.
Unfortunately the documentation is pretty poor on this topic, but you can find a few things here : https://puredata.info/community/pdwiki/PdInternalMessages
There is a way to make your own documentation, regarding the messages that can be sent to PD.
This is a tool that can be useful if you want to control PD’s settings and other stuff from within a patch, in non-GUI mode (for instance, turn DSP on/off, increase the latency, etc.).