Create Certificate Request for Windows2003 certificate authority without using website

I would like to be able to create certificate requests that I can
submit to my CA without using the CertSrv website because I am running
sharepoint services on it and read somewhere (but not able to provide
the link) that is not possible to have the Certificate Authority
websites on a sharepoint machine.

My problem is that I need to create client certificate requests so that
I can issue certs to individual users and use the certificates to
authorise access to a website.

Can anyone tell me how I can create a valid client certificate request
without using the CertSrv website?

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