Environment configuration
=========================
Copy php4ts.dll  C:\WINNT\system32\

PHP configuration
=================
Rename php.ini-dist to php.ini and edit as follows:
extension_dir = C:\php\
doc_root = C:\Programmi\Apache Group\Apache\htdocs

Copy php.ini to C:\WINNT\system32\


Web server configuration
========================
edit httpd.conf:

add the following lines in the correct sections of the configuration files:
LoadModule php4_module c:\php\sapi\php4apache.dll
AddModule mod_php4.c
AddType application/x-httpd-php .php


TEST
====

Put a file, say phpinfo.php, whose content be <?php phpinfo(); ?>, 
into doc_root and try http://localhost/phpinfo.php.

Be careful that phpinfo.php's extension be *exactly* ".php" and not ".php.txt"!