Hi I wonder if I could achieve an OVERLAY effect on a particle? Setting this flag makes my effect invisible and the flag is never mentioned in relation to effects...

afaik there was a FLARE flag in A5 or so. They removed it and now you have to use tga sprites with an alpha channel or you have to make a call of bmap_to_alpha.
See:
http://manual.conitec.net/aAnhang_Syntax.htm
under FLARE

reagards Alain

Thanks, I used bmap_to_alpha and it works as expected!