bld
  - The root of the build tree. Each project has a subdirectory under
    bld. For example:
      bld\cg       -> code generator
      bld\cc       -> C compiler
      bld\plusplus -> C++ compiler
      (see projects.txt for details)

build
  - Various files used by building tools. Of most interest are the
    *.ctl files which are scripts for the builder tool (see below)
    and make files (makeint et al.).

docs
  - Here is everything related to documentation, sources and tools.

distrib
  - Contains manifests and scripts for building binary distribution
    packages.

contrib
  - Third party source code which is not integral part of Open Watcom.
    This directory contains especially several DOS extenders.

build\bin
  - This is where all build tools created during phase one are placed.

rel
  - This is default location where the software we actually ship gets
    copied after it is built - it matches the directory structure of
    our shipping Open Watcom C/C++/FORTRAN tools. You can install the
    system by copying the rel directory to your host and then setting
    several environment variables.

    Note: the rel directory structure is created on the fly. The
    location of rel tree can be changed by `OWRELROOT` environment
    variable.