Pairing a Bluetooth keyboard--especially the official HP Wireless keyboard--to your TouchPad is an excellent way to increase your productivity and typing efficiency. But there are times that you may still want to use the on-screen virtual keyboard, even if you have a Bluetooth keyboard connected to your device. With the official HP Wireless keyboard, all you need to do is tap on the key (top row, third from the left) to toggle the virtual keyboard on or off. You can even still use the Bluetooth keyboard when the virtual keyboard is active on the screen.
Unfortunately, the only way to initiate this toggle is from the Bluetooth keyboard itself. If the keyboard is not within reaching distance and you want to use the virtual keyboard, you either have to toggle Bluetooth off in the Device/Connection Menu, or go into Bluetooth Preferences and tap on "HP TouchPad Wireless Keyboard" to disconnect it from the TouchPad. To reconnect the Bluetooth keyboard once you want to use it again later, you just need to start typing on it and it should automatically reestablish the connection.
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