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could someone help me with this method of arcobjects? I don't know what the parameter "hint" means. Thanks.

ISurface.Locate Method Returns the intersection of the query ray and the displayed feature. [Visual Basic 6.0] Function Locate( ByVal pRay As IRay, _ ByVal hint As Long _ ) As IPoint

Parameters pRay [in] pRay is a parameter of type IRay hint [in] hint is a parameter of type long ppLocation [out, retval] ppLocation is a parameter of type IPoint

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I'd try passing 0 as the hint argument. If that works, try passing different values and examine whether the result differs. Chances are this argument is reserved for future use and has no effect at all. –  Petr Krebs Dec 13 '11 at 20:16
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