Need some help understanding how to setup FastCGI

Hi all, I'm trying to setup FastCGI to run PHP files from Apache2, and
I have it working but not quite right.

Here are some details:
1. I'd like to have about 80 PHP processes available to run the PHP
stuff. I would like to know how to do this both by setting a fixed
pool of 80 processes or having a dynamic set between 20 and 80.
2. All PHP processes are for the same website, I have no need for
suexec, and don't use FastCgiWrapper. Right now everything is on the
same webserver, so I was going to use UNIX domain sockets rather than
TCP.
3. I use an opcode cache for PHP so PHP ideally would only see one
master process so it only creates a single shared memory segment for
the compiled code.
4. I don't want a user accessible fastcgi-bin URL!

This is what I have in http.conf

LoadModule fastcgi_module modules/mod_fastcgi.so

<IfModule mod_fastcgi.c>
    SetEnv PHP_FCGI_CHILDREN 80
    SetEnv PHP_FCGI_MAX_REQUESTS 500
    FastCgiIpcDir   /usr/local/apache2/pipes
    FastCgiServer

    AddHandler  fastcgi-script              .fcgi
    <Directory /fastcgi-bin/>
        Order allow,deny
        Allow from all
        Options ExecCGI
        SetHandler fastcgi-script
    </Directory>
    Alias /fastcgi-bin/ /usr/local/apache2/fastcgi-bin/
    Action      application/x-httpd-php4    /fastcgi-bin/php4.fcgi
    Action      application/x-httpd-php5    /fastcgi-bin/php5.fcgi

    AddType     application/x-httpd-php5    .php5
    AddType     application/x-httpd-php4    .php .php3 .php4

</IfModule>

It seems to create a dynamic pool of 1-10 PHP processes, though.

I get confused with how to handle Apache2's multi process-thread
configuration with FastCGI's multiple processes and PHP's
PHP_FCGI_CHILDREN and have the op-code compiler know that they are all
one thing...
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