Thank you for your post.
FileMaker Pro does have the ability to display your databases over the web using Instant Web Publishing. FileMaker Server product also gives you the ability to display your databases over the web using Custom Web Publishing with PHP or XML.
With Instant Web Publishing, launch FileMaker Pro and open your file. Then, pull down the File menu and select "Sharing -> Instant Web Publishing". When you turn on Instant Web Publishing and set the user access to All Users, anyone can have access to your file. You can even set up accounts so that users can only view and/or edit and/or create and/or delete records. When you go to print, you are limited by the Browser being used.
The Customer would enter the URL address of the computer running FileMaker Pro, and they will be able to access the file(s).
FileMaker Pro needs to be running in order for web clients to see the FileMaker Pro file. If you do not want to host the file yourself, there are FileMaker hosting web sites, so you should search for one in your area.
If you have any additional questions, or need clarification for any of the above information, please let me know.