Point sprite capabilities...

Well, point-sprites are supported if D3DCAPS9::MaxPointSize is > 1. Check the docs for D3DCAPS9::MaxPointSize and "Point Sprites" (Type it in the index)

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what is the call to check for hardware support of point sprites?

According to this page if the D3DCAPS9.MaxPointSize is equal to 1.0f then you DONT have hardware support.

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Is using point sprites a good way to create a particle system?

Yes, I believe that PSprites were primarily included in the API for this exact purpose (they do have other uses as well). Look up the Point Sprites sample if it's still in the SDK - its quite pretty and probably exactly what you want [grin].

hth
Jack

[Edit]Coder got my reply in while I was typing. oh well [headshake][/edit]

Thanks guys.

Mark