#include defs.wh
#include defs.wh2
#define _PAGE-TITLE_ Predefined variables
#define _TITLE-HEADER-TEXT_ Predefined variables
#include head.wh

There are a number of predefined variables which you can use.
Some of these variables are <i>Best Guesses</i> which may turn out
wrong.  In this case it is best to override the default value with
one of your own using the <i>define</i> directive.
<p>
The standard variables are:
<ul>
#pragma nodefine
    <li><i>__CWD__</i>
    	This is the current directory when _WEBC_ was started.
	This can be used to build absolute filenames for inclusion.
    <li><i>__DATE__</i>
    	This is the current date.
    <li><i>__TIME__</i>
    	This is the current time.
    <li><i>__MODIFIED__</i>
    	This is the date of the source file.
    <li><i>__SITE__</i>
    	This is a <i>best guess</i> of the name of this machine.
    	This could be incorrect for a variety of reasons, so check
    	the value on your machine, and if necessary, override this
    	variable.
    <li><i>__FILE__</i>
    	This is the name of the source file being processed.
    <li><i>__HTMLFILE__</i>
    	This is the name of the HTML file being generated.
    <li><i>__USER__</i>
#pragma define
    	This is the user name of the person running _WEBC_.
#pragma nodefine
    <li><i>__EMAIL__</i>
#pragma define
    	This is the <i>best guess</i> of the email address for
    	the person running _WEBC_.  There are a number of
    	reasons that this could be wrong, so check out the value,
    	and override the variable if appropriate.
#pragma nodefine
    <li><i>__VERSION__</i>
#pragma define
    	This gives the current version ID of the _WEBC_ compiler.
</ul>

If additional system variables are defined they will always have
two leading and trailing underscores.

#include tail.wh2
#include tail.wh