After reading every one's utmost sincere assertions, I look up the ultimate authoratative source (
http://www.kinook.com/UltraRecall/Ma...sert+hyperlink). The manufacturer default turns out to be Ctrl+Shift+L.
But if you press Reset All in Cutomize | Keyboard, definitely Ctrl+Shift+K is assigned to Insert Hyperlink.
Now every one is confused.
Armstrong