Can some explain the "hz" parameter?

BlitzMax Forums/BlitzMax Beginners Area/Can some explain the "hz" parameter?

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Recap on the "hz" parameter. I never want to try to force a refresh rate on an end user's system. I want my game to adapt to their settings.

"The smoothest method is to use a hertz value of -1 (>>>should be default refresh at that screen res<<<) and use a fixed logic loop, as you've been doing, with flip 1."

To have the device use the GPU's default refresh rate, should I pass a value of "null", "0" or "-1".