How should i make a script get the amount of clickable guis and detect if one is clicked?

Im trying to make a mass script which will help with my inventory im making but ive come across a problem; what i want to do is try to make is where a new gui is created, ive got those down, and they do have their own assigned names, but i need help on seeing if any of them were clicked. Can someone help me understand how i can do this? Im not asking for script really, but rather understanding. We can call the clickable gui nov. 1 A and clickable gui nov. 2 B. Sorry if the wording was really bad, im getting tired. The location of the script is in a gui next to A and B.