Twist Web Search is engine to use inside a web site. Simple Crawling System is available to submit URLs and Links from submitted URL will be automatically added to search database when admin run crawling. Once crawling is done the links with their contents (Plain text from web link) will be available to search. If the total web site is linked to it's home page, you need jut give home page url to the sytem and run crawling once. You do not need to much work to implement a search system inside your web site.