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I know how to open keyboard in landscape, and keyboard has shown. but I can't tap anything at keyboard, but if change to portrait, everything is OK , any character I tap can be input into dos command line.
You always have the option of swiping (from LEFT to RIGHT) across your screen to bring up the "Quick Menu". From the Quick Menu you can enable/disable the keyboard. You can also swipe down (from top of screen to bottom) to bring up the title bar and select the keyboard from there as well.