Sorry, but the hosted files must be open on the host computer. The Filemaker application or FileMaker server is responsible for hosting the files so that they are accessible over the web. If the file is not open on the computer via one of these applications, then they will not be accessible. This is also true for hosting the file so that it is accessible to Filemaker Pro and Filemaker Go clients.
Thank you, I just found that information in my manual but you stated it in a way that I better understand. That brings me to a few more questions. If I want to have more than one website, for instance, one for each database, that are on and open on the host computer is that possible? If I am editing a database on the host computer and someone accesses it via the web to view/edit, does the database get locked to either the host or the other user? Maybe it would be best to turn off web sharing while editing from the host computer but I would like to avoid this.
One copy of FileMaker can open multiple database files. So this it is possible for it to host more than one. There are limits however that may lead you into either acquiring a copy of FileMaker server advanced or contracting with a hosting service as FileMaker supports only 5 IWP connections at one time and this total will apply to all users accessing any one of these databases.
It is indeed much safer not to make design changes to the database while it is being hosted either for FileMaker Client access or from web browsers. The changes you make can briefly lock other users out of entire tables.
Another option is to take a copy of the databse to a different machine, modify it and then put it back up on the server. Using a data separation approach where all layouts, scripts, etc are in one file and the data tables in the other can make changes to the user interface much easier to deploy on this type of situation.