Below is an application of stack and queue. There are 7 buttons each having a name of a cartoon player. There are five extra buttons at the bottom, for running the application as desired. First you have to select a cartoon player. Then, if you push "add" you will see the cartoon player in the stack (or in the queue). By selecting the cartoon players and pushing "add" you can create a stack (or a queue). You can select the queue/stack options with the help of the combo box at the bottom of the screen. "Reset" button will empty the stack or the queue. "Refresh" button will refresh the stack or queue (this is needed especially in case when you form a stack and then you decide to change it to a queue.)