what's the difference between fastcgi and spawn-fcgi?

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Linux

network

I'm confused by the concepts of fastcgi and spawn-fcgi. As far as I understand, fastcgi is a protocol, not a implementation. One of the implementations is Open Market's FastCGI(http://www.fastcgi.com/drupal/[^]), and nginx (or other web servers) adopts it.
Spawn-fcgi is not a FastCGI，it's a tool for manipulating the fcgi applications which are created by myself.
quote from wikipedia "Instead of creating a new process for each request, FastCGI uses persistent processes to handle a series of requests. These processes are owned by the FastCGI server, not the web server". Is spawn-fcgi can be considered as a FastCGI server ?
Is the description above right?
Thanks.