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9420 Thai Keyboard for Android can be downloaded from the link below.
(It's best to use your device (your phone/tablet) to access the link. It'll install itself once you clicked on the downloaded file)
[Setting to download programs from Non-Android-Market]
To download programs outsize Android Market, you will need to turn on the option "Unknown sources"..
- Goto Android setting. [From Home] -> [Press Button "Menu"] -> [Choose "Setting"]
- Select the option. [Choose "Applications] -> [Turn on - Unknown sources]
- You should, now, be able to download 9420 Tablet Keyboard for Android