How to access controls of one window from another?

[gtan]

I have created a Qt Gui application which has two forms: mainwindow.ui and childwindow.ui.

I have a LineEdit controls on both forms. How can I access the text on the mainwindow from the childwindow and vice-versa?

Normally, on the same from I will use the code:

ui->lineEdit1->text();

ui->lineEdit1->text();

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