I'd like to set up multiple (OK, two) wiki sites running on the same server. We can use the same version of the wiki software (one will be 1.6.3 until I get around to upgrading it, the other will be 1.6.x where x is the latest 1.6 release), so don't need to worry about running different PHP/MySQL versions. Now the questions:

1) It looks like the best way is to set up another wiki directory with another copy of the wiki software etc. in it, and do whatever apache hoodoo is needed to direct requests to that wiki copy. That sound right? We'll probably simply use the ip number of the machine, rather than getting a new domain name, as the new wiki will be private. But I'll worry about that when the time comes.

2) It would seem that all I would need to worry about with MySQL is to make sure I set up the new wiki with a new database, but otherwise not need to fiddle with MySQL. Is this correct?

3) Biggest thing is that I need to ensure the new wiki is private--it will contain very private stuff. (If I told you what, I'd have to kill you. I know, an old line, but it never ceases to be funny to double-digit IQs such as my own.) Opinions on this? Aside from the general machine setup (which I'm as sure I can be is reasonably secure), would it be best to use Mediawiki security features, or should I instead go into the Apache side of things? And are there any special things I need to look at to ensure that users of the public wiki cannot somehow access the private wiki? (I'm guessing not, since the wiki code and databases will be completely separate, but one wants to be sure...)

In advance, many thanks, Ken