Internet Contact Suite 6.5

[Alex]

Hi Everybody,
I'd like to have some info about Internet Contact Suite:
I read on manuals that even Microsoft and Solaris platforms are supported and concerning Web Servers and Servlet Server you have Apache/Tomcat for Solaris and IIS/JRun for windows. Is it True?
I read that at minimum you must have two different Servers for ICS and every server must have its own web server and servlet server, so you have got to have at minimum two different installations of web server and servlet server. Is it true? And why? What about the content of the two different web servers? Where do I have to put http pages regarding webcollaboration, etc.? On what web server? Is it possible to use only one web server?
Where do I have to put the two servers? In DMZ? Or I have to put some processes in DMZ and some other in Enterprise Lan?
Thanks,
Bye