What is ESIX?

[Michael Herold]

I am sorry for asking a dumb question!  Can someone explain to me
who produces ESIX and give me some more details about it.  I am 
interested in running some version of Unix on a 386 pc.  I have 
looked at the products from SCO and Interactive but did not run
across anything named ESIX.  I obviously hope that this is a 
better product, at a lower price and with better customer
support than ...

Michael