Don't know how helpful these may be but try:

http://www.openwatcom.org/index.php/Manuals

Manuals

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Note:
The following documents are PDF versions of online books shipped with
Open Watcom in Windows, OS/2 and DOS online help formats.

An alternative source for these is ftp://www.openwatcom.org/manuals/.

If you do not have a reader for the PDF format, you may either go to
PDFreaders.org for a free PDF reader, or to
Adobe Acrobat Reader
for a proprietary reader. Both alternatives supports several platforms.


[edit]Open Watcom C/C++ Reference Documentation
C/C++ Getting Started Guide
C/C++ User's Guide
C/C++ Programmer's Guide
C/C++ Tools User's Guide
C Library Reference
C++ Class Library Reference
C Language Reference