Pop Up Windows in Qt

[AlecC]

Hi, I'm new to Qt and I wanted to make a gui for a program I was making. What I want to know is how exactly do you make a pop up window for a program because my program is intended to check a website and tell you if an update had occurred. Originally I just made it print out something like "Update" on the command line. But since I added a GUI I want it to now have a dialogue box come up that says "Update" when an update does occur. Also could someone tell me how to make another dialogue box with a list that just keeps track of all previous updates like in my original one i had "Update 8:45" and "Update 9:00" with the time it happened next to it . So I want to make some kind of window, dialogue box, or tab that keeps track of it or at least dumps out the string of it into a list continuously after each update. Help please I'm really desperate right now >.>, I really appreciate it.