I'm doing tests for a project at my school where I came up with the idea of making a computer rental system, I want to do if I rent a computer at the end of the time the corresponding button changes but can add more time, for example , if they rent for 1 hour but then they want to add another hour more to be able to modify it directly from the execution and not close or open the program again. I saw that there is a program called Cyber Control and it seemed to me that it does what I'm looking for, if someone could help me, it would be very helpful. THANK YOU!