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Forcing the mouse to follow one single line

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I'm rendering many lines (with GL_LINES of course) on the screen, and I can select any one of them (with glPickMatrix) and any vertex in the line. Is there any easy way to force the mouse (once a line and a vertex are selected and highlighted) to move along this line (to the next vertex)? My plan is this: compute the projected 2D position of the next vertex, then force the mouse to appear there with SetCursorPos. Any better idea? Is there an easier way to compute the projected 2D position of a vertex than multiplying it with all matrices? Thanks. [Edit:]compute the projected 2D position: gluProject :-)

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