I installed PmWiki. Got an installation-successful message. Went to the page. Nothing there. Went to the Admin log in. Nothing there. Waited three hours. Tried the page again. Still nothing there so I deleted the installation. Did a re-install. Same thing. Deleted the installation.
Tried DokuWiki. Same thing. Deleted DokuWiki. Tried MediaWiki. Same thing. Deleted MediaWiki.
Installed PmWiki using default directory. Same thing. Deleted installation.
As far as I can see, wiki installation is a big FAIL! I did not try WikkaWiki as I didn't like the look of the pages.