IIS is recommended for Windows, as vhttpd (the integrated Texis web server) is only supported under Unix. There is a Texis Monitor web server that can be used under Windows (it is in fact used internally if the ISAPI filter is installed), but it is only recommended if another web server is unavailable.
unfortunately the install insists on installing into the default web site (which we do not use)
Q1 : Can i install texis into a non default web site?
Q2 : Can i make texis available to all web sites on the server through their url (site1.coe.int/texis, site2.coe.int/texis, ...)?
Q3 : Can i get rid of the /webinator part (maybe by renaming the directory to something else. The reason behind this is that folks over here are a bit touchy about the urls (they think 'webinator' resembles 'terminator').
A2: Yes, you can repeat the above steps for multiple websites and it will function fine.
A3: Yes, everything after the "/texis" in the URL is a reflection of your "<installdir>/texis/scripts" folder. There's a webinator folder in there, and a "dowalk" file. Simply rename the folder to whatever you like.