As part of our new partnership with jQuery, yesterday we announced the availability of the official IntelliSense documentation file. How do I use this file (today)? Why do we have a server-side conditional statement? IntelliSense disregards conditional statements of this type, and thus loads the "vsdoc" file (overriding the normal one). At runtime the if (false) statement will ensure it this documentation file is not rendered (and executed) as script. This trick allows the "switching" behavior you want.