There are plenty of interesting comments in the ReactOS source tree ...
zlib headers: /* various hacks, don't look :) */FreeType's TrueType interpreter: /* UNDOCUMENTED! */ /* */ /* The behaviour of an MIAP instruction is quite */ /* different when used in the twilight zone. */ /* */ /* First, no control value cutin test is performed */ /* as it would fail anyway. Second, the original */ /* point, i.e. (org_x,org_y) of zp0.point, is set */ /* to the absolute, unrounded distance found in */ /* the CVT. */ /* */ /* This is used in the CVT programs of the Microsoft */ /* fonts Arial, Times, etc., in order to re-adjust */ /* some key font heights. It allows the use of the */ /* IP instruction in the twilight zone, which */ /* otherwise would be `illegal' according to the */ /* specification. */ /* */ /* We implement it with a special sequence for the */ /* twilight zone. This is a bad hack, but it seems */ /* to work. */Cabinet manager lib:/* * ugh, well, this ended up being pretty damn silly... * now that I've conceded to build equivalent structures to struct cab.*, * I should have just used those, or, better yet, unified the two... sue me. * (Note to Microsoft: That's a joke. Please /don't/ actually sue me! -gmt). * Nevertheless, I've come this far, it works, so I'm not gonna change it * for now. This implementation has significant semantic differences anyhow. */adns lib:/* Define if we want to include rpc/types.h. Crap BSDs put INADDR_LOOPBACK there. */kernel FPU code: /* FIXME: is this removed for non-debug builds? I hope not! */kernel memory manager:/* * FIXME: Has something to do with crash dumps. Do we want to implement * this? *//* FIXME - don't have a clue if this is right, but it's better than nothing */