Ideally for B4* when the caret is on a keyword like:
You press F1 and in B4J for example it would open a new tab in your browser (check for internet connection first) and take you to:
http://www.b4x.com/b4j/help/jfx.html#button
B4X:
Buttonhttp://www.b4x.com/b4j/help/jfx.html#button