Now consider the following IIS6 (Windows Server 2003) screenshot: This allows multiple versions of the framework to live beside each other in IIS5. (v1.0, v1.1 and v2.0) If a process for a particular version of the framework doesn't exist, as soon as it's needed, a new process will be spun up. There is one per version of the framework. Notice the 3 processes called aspnet_wp.exe. Following is a snapshot of Windows Task Manager on an IIS5 (Windows 2000) server: There are a couple gotchas to consider with running multiple versions of the framework side by side. The install itself is quite small, for example the v2.0 download is 22MB. Simply install the framework version on your server and it will be available to you. Each site, or even a vdir (Virtual Directory) within a site can have its own version of the framework installed. Version v1.0, v1.1 and v2.0 can all run together at the same time on the same server. Microsoft has done a great job of allowing multiple versions of the framework to run side by side. But, like anything else, this brings with it a number of considerations. Like any good technology, ASP.NET continues to evolve as new versions are released.
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