Potentially dumb PHP question

I have PHP4 installed on my server. I now have several different reasons that I need to have PHP run in CGI mode. So my question(s) is:

If I recompile in CGI mode, do I loose the normal PHP web server mode? What exactly does running is CGI mode do for me? How hard is it to recompile with CGI mode enabled?

Any help is appreciated...

 

 

 

 

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