Monitoring computer screen and trading upon alert

Hi I want you to make software, let's give the software a name " rocky", I want to explain the project to understand the possibility, example: let's assume I have a computer and there is some internet browsers open, now the software "rocky"  you will make is monitoring the computers full screen or a region of screen continuesly and as soon as the internet browser updates with some graphical changes (which is the text "buy" "sell") popsup on the screen "rocky" immediately send a alert to a software "metatrader5" and as soon " metatrader5" receives the alert "metatrader5" will trigger a trade as per the alert it has received from "rocky", if the pop up graphics changed in to "buy" text then rocky will send alert to metatrader5 and metatrader5 will trigger a buy trade, I hope this will help you to get some basic idea about the work. Thanks