Any Site Launcher for the BlackBerry® PlayBook™ allows you to create a short-cut launcher that opens any site of your choice in its own browser window! This allows you to browse between two different webpage at the same time (by using this app and the native web browser).
Side Note: Currently there is no 'back' button in this app.
This app is currently available in BlackBerry App World for $0.99
PS: Since I am a 'Writer' for BBOS, I just wanted to be clear, this app has no affiliations with BBOS .