ESL proposes 2 types of Silverlight projects: One is "Silverlight Project", it's used to create Silverlight Application. Another is "Silverlight Web Project" which comprises 2 Eclipse project, one which holds the Silverlight Application while the second one is the Web application which hosts the Silverlight code.
The simple way to run the Silverlight project is right click on the project and select Run As->Silverlight Web application. This menu creates automatically a Run configuration for this project.
Or user can configure it by hand.
For a Silverlight Web Project, you need to right click on a *.html file and select Run As->Silverlight Web Application. This menu creates automatically a Run configuration for this project with this html as starting page.
Or user can configure it by hand.