Hi, i'm working on an application cosisting of 7 individual jFrame screens. I was wondering, is it possible to code a button to go back to a previous screen, without removing any data a user has entered - i.e without reloading a new version of that screen? I other words, i'd rather use a button than select the screen from the toolbar!

Of course. I hope you use a model to contain your data and have your screens read the data to be shown from the model?
If so, just show the screen like you would from the toolbar or menu.
If not, it's time to rethink your application architecture.