Redirects and mode rewrite etc.
May be these links can help you:
Mod-Rewrite basics and
mod_rewrite and
Gary Keith's Website where the wheel is invented for you.
If you need more:
Look along the lefte edge of the index page of my site MultiFinanceIT and on the security subpage (site navigation field upper right) and the "Links" meny on that page.
Also try:
KW search:
(an introduction to advanced
SEO) + kgun site:webproworld.com
Other panels.
SE KW:
plesk, cpanel, control panel software