Blitz3D refresh rate behaviour desired

All retail games use the default desktop hz for that resolution, which is a really happy medium. How do I achieve this in BlitzMax? Blitz3D did this also, however BlitzMax really does not, on all 3 pcs I have tried it on.

Retail games do it to minimise any eye strain - desktop hz is usually desired hz.

What do you think?

wglSwapInterval is the same thing as the Flip() optional parameter in B3D.

I think it is like this:
wglSwapInterval 1 - vwait
wglSwapInterval 0 - no vwait (fast)

Then call SwapBuffers()