What is the difference between "run on web server" and "run on reporting server" commands on developer studio?

We have an html form page which was prepared on resource layout painter,and when the users run the report, the dynamic drop down boxes come empty,same thing happened if we run that by using "run on reporting server" on developer studio. but if we run it by "run on web server" on developer studio, then dynamic drop down boxes show the correct values. what can be the problem,and is it possible for users to run the reports from the web server without using developer studio

regards.

Run on Web Server runs a HTML page directly on the WebSERVER. You can run it out of devstudio and on the browser with this code:
http://servername:8080/approot/appname/name.htm

Run on Reporting Server does a run-HTMLFORM from the reporting server. Note, during development when you click "Run" you are really running on Web Server, so that is what you do once the html file is closed.

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