Some readers may be disappointed that certain procedural parts of this book--notably that which has to do with compiling CUPS into the Unix kernel from source code--are exclusively Linux based. You can extrapolate other Unix flavors' procedures from the Unix instructions, but explicit how-to information would be nice. However, explanatory information on the Internet Printing Protocol (IPP, on which CUPS is based) is nicely written, and the CUPS documentation itself--particularly the instructions for developing printer drivers (in C) is excellent. Read this if you want to develop printer drivers for what's likely to become a standard on consumer Linux distributions. --David Wall