This is a quickie – Sometimes you want to refer to a point that just
doesn’t exist. In the example below there is no intersection between
the two lines drawn. Or is there?
Lets say you want to pick the Intersection of the two red lines in
that picture. When prompted for a point, pick the Intersection osnap.
Then hover over one of the lines. You will notice an ‘X…’ followed by
and ellipses (three dots). Pick the line. Now pick the other line.
AutoCAD will wait for you to pick two lines if you use the Intersection
osnap!
How nice of them.
The H-Factor 
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