anyone can tell me how can I will check index and cache in several search engine. what is algo behind index and caching first my web page index or cache? If first is indexing then after caching I will make some changes then again caching or indexing.
You should word that bit differently -- Yahoo doesn't display PR. Any decent search engine these days certainly calculates link pop and some form of PR. I'm sure their algo is quite a bit different from Google and they obviously don't give you a little green bar to obsess over, but they almost certainly have something similar to PR that that use behind the scenes.
I second mickmel. I think they should have some kind of score similar to PR. They take inbound links as one of the factors for ranking and I bet they should put weight on the various inbound links.