VLD and max altitude

Can someone tell me if my thinking is correct here. First VLD is the
speed where there is the least drag on the plane right? So it takes the
least amount of power to maintain level flight at VLD, any slower or
faster in level flight requires more power? Now suppose you are at an
altitude where the fastest speed you can maintain is VLD, would that
mean that the plane can't climb any higher? Also would that be a
reasonable way to determine VLD, (i.e. climb as high as you can and the
indicated airspeed at that altitude would be VLD)?

--
Chris W

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