Way to interlink and use data from an existing program (.exe) with a new one (under progress)

Question

So i had this question about sharing data between computer programs.

SCENARIO:

Check diagram here simultaneously to completely understand the scenario

Consider 1,2,3,4 to be some sort of sensors which communicate with panel. All communications between sensors and panel is made via wi-fi which is encrypted. these data are decrypted by panel and sent over to pc via physical connection (say USB A or Ethernet). There's program "X" on pc which receives data from panel and shows real-time status of sensors and raises an alert if any issues found (say low battery on sensor).

So my question is, How can I listen to issues raised by program X?; and in-case there exists one, how can I access the data on raised exception to my app?

other info, I was said that the program X can create an excel sheet containing all details about the raised issue on panel. idk felt like mentioning this.

all the part up to "Panel's program, (Program X) " is already programmed and i do NOT have source code. my main objective is to build "My app" that receives data from program X and uploads it to backend.

Any suggestions may help!! pls drop some hint, on which ill do the necessary research and stuff.

Thanks for helping.