Using $UserHeader lets you insert custom HTML code into the HEAD of your renderede HTML.
E.g. if you use this :
$UserHeader = <<EOH; <meta name="GENERATOR" content="jEdit on Mac OS X" /> <meta name="GENERATOR" content="nano on Gentoo Linux" />
EOH
Your HEAD section will end with something like this :
<HEAD> <TITLE>Bit-Man @ Home: HomePage</TITLE> <META NAME='KEYWORDS' CONTENT='Home, Page'/> <LINK REL="stylesheet" HREF="/wiki.css"> <meta name="GENERATOR" content="jEdit on Mac OS X" /> <meta name="GENERATOR" content="nano on Gentoo Linux" /> </HEAD>