Silverlight 4 RC - SLLauncher silent installs

One of the features we added in this release was using the sllauncher.exe (which is the program that assists in out-of-browser applications) to provide silent install capabilities for your applications. The primary scenario here would be something like CD-based installation situations. Using a command like this:

   1: "%ProgramFiles%\Microsoft Silverlight\sllauncher.exe"  

   2:     /install:"D:\deploy\demoapp.xap"  

   3:     /origin:"http://foocompany.com/apps/ClientBin/demoapp.xap"  

   4:     /shortcut:desktop+startmenu  

   5:     /overwrite 

would enable you to deploy an application in this type of a situation. Setting the origin flag here enables the application to determine where it would get future updates from if CheckAndDownloadUpdateAsync methods are called within the application.

Source : http://timheuer.com/blog/archive/2010/03/15/whats-new-in-silverlight-4-rc-mix10.aspx