Error message tags are WBSP placeholders for various
parts of an error message. They are not intended to be used on the ordinary WBSP
pages nor in normal circumstances, but in error template file (defined by
WB_ErrFile variable and sent to client when error occurs). Their purpose is to
format and/or hide some of the error details. Also, when output type
(Content-type) is not text/html
they can be used to
generate proper error report (e.g. XML, XHTML, WML, RTF, etc.)
$WBERRDESC
$WBERRMSG
$WBERRNUM
$WBERRMAIL