Vendor identification code?

[Sandy Zinn]

Does anyone know how I can determine, from within a program, what brand
of UNIX I am running in?  I particularly need to distinguish AT&T System
V from that of DELL/Interactive and SCO.

Please e-mail replies to:
                         rti!mcnc!ntpdvp1!sandyz
Thanks for your help.

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Sandra Zinn  * *  DMS-10 Division, Northern Telecom Inc., RTP, NC