phplib的安装

请教高人：
phplib-7.4a在windows下该怎么安装？我在php程序中该怎么调用？
操作系统：windowsXP
开发环境：Windows+Apache+Mysql+Php
开发环境安装目录：H:\Install\Web+Midware\PHPnow\PHPnow-1.4.4
安装目录中的文件夹：
                    Apache
                  htdocs
                  Init.cm_
                  MySQL-5.0.51a
                  php-5.2.5-Win32
                  Pn
                  PnCmds
                  PnCp.cmd
                  Readme.txt
                  Standalone
                  ZendOptimizer
开发目录：H:\Install\Web+Midware\PHPnow\PHPnow-1.4.4\htdocs