I personally use no mouse while operating with my thinkpad, I know it may be annoying for some people.
I am used to so many keyboard shortcuts under Windows instead of using mouse (that it successfully made me frustated at my first time using MacBook). As for the mouse function, I only use the red trackpoint provided in the thinkpad.
Aha, I finally found the answer : it’s another shortcut that I never known before, and now I name it as stupid windows features? It’s Ctrl+Alt direction key that changes the screen orientation.
Eg. Ctrl-Alt-Up – right side up
Ctrl-Alt-Right – 90 degrees
Ctrl-Alt-Down – 180 degrees
Ctrl-Alt-Left – 270 degrees
Isn’t it nice? Try it guys! Enjoy your adventurous exciting working with fake tablet-PC-to-be!haha..
Tracing back, it was so possibly that at the instant panic and confusion moment, I was unintentionally pressing those pads as I used Ctrl+Right to skip one word repetitively.