Hi guys!
I make a program for students to practice calculating. For some kinds of practices, the students are allowed to use a calculator, which I already made in a single form, but for other practices, they are not allowed to use it. So when they open a form for practices with + - * / , the calculator have to can not be opened. And if the calculator is already opened, the form should close when another form is opened.
How can I achieve this?
Thomas.