I'm working on my 2nd year Project and I need your help.I want to create a DIY Store System that will contain multiple windows.All the screens are done, just need the idea how they will be managed all togetherThere is a login window with the company logo, address, textfields etc that will pop up when the system is started. Then the tricky part begins, there are 3 types of users (admin, sales and stock user) and every one of them will have a different main menu(GUI). Any ideas how to deal with this problem?