"Tim Nikias" <tim### [at] gmxde> wrote in message news:3CCFEE01.ED9DD119@gmx.de...
> Hm. So, is it for BMP? I couldn't find that,

Yes. When the BMP is created, a 'magic number' is written to the start of each
line. The continue trace code uses that to determine if the line has been over-
written by the renderer yet.

-- Chris

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