Hi,
An example: The following lines are php code in a WikiMedia page.
I try to believe you mean your local MediaWiki install instead of Wikimedia servers ;-)
echo date('Y-m-d, H:i:s');
$dbw->query("delete from cur"); would show better how useful your plugin is.
When this page is first rendere it produces the output: 2004-10-12 01:11:23
If it is not wikimedia, and I still hope it is not, and you did not setup otherwise, you nay have just one cache - the one in your browser. If you use http proxy cache, then pages might be still there. If you use parser cache, then (hey, you really use parser cache?) you should not.
How to # prevent a page from being cached?
Set cur_touched on every hit, or remove cache-control directives in source and disable parser cache. Or extend communcation between parser and parsercache. :)
# force a reload of a page?
Use forced-reload feature of your browser.
# clear a certain page from cache? # clear the cache?
Which cache?
Cheers, Domas