continuously tracking a point co-ordinate

Hi All, I got an Algo problem here.

I want to draw a straight line.

while waiting for user's input of 2nd point with :

2nd_point = axlEnterPoint(?prompts ...) , I want to capture the cursor position and draw the line 

first for user to preview, with axlPathStart and axlDBCreatePath...

then until user confirm and click.

how shall i go around with this?

such that the while loop can continuously axlCursorGet(nil)  (so that can draw the line first)

while it is hung @  2nd_point = axlEnterPoint(?prompts ...). Thx in advance~