I'm familiar with the concept of portable applications, and I use the portable version of many of the applications that I use on a daily basis. But they don't need any special "platform" to run them - you just unzip them, and the configuration information is kept in a file instead of in the Windows registry. You can put the whole thing on a USB drive if desired, or wherever you want. So what exactly is the purpose of this PortableApps "platform"? What does it do? Why should I install it?