Q. Most Search Engines only allow you to register with them once, don't they?
(What if I change my Web Page address or start using another provider so that I have two Web Page addresses to promote? Would I then be allowed to register my new Web Page address again?)

Normally, this question refers to the Directory Engines. With Directory Engines, you only need to submit your web site once at least you make changes to your web site contents or URL. For Spider engines, the search engine "Robot" will re-visit your web site regularly(normally once or twice per month) and update the changes you have made.

As a general rule, you can re-submit your web site again if you change your web site address or change your web site contents. Further more, we suggest that you should always make some changes to your web page contents(change the title, keyword or description) and re-submit it regularly. This will make search engines to consider that your web site are well maintain and also help you to get to the high ranking.