The documentation for QTextBrowser is at http://doc.trolltech.com/4.7/qtextbrowser.html, and you can find all its methods here. Also, since QTextBrowser inherits QTextEdit, you can also use the methods in http://doc.trolltech.com/4.7/qtextedit.html.
Anyway, setText() removes old text before adding new ones. To add text without removing the old ones, use append().
If I'm not mistaken, the QTextBrowser should automatically have a scroll bar.
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