xtra-pc is a custom made linux version OS made to be similar to windows written to a usb stick. I watched and read videos and reviews. it seems to work well with a wired or wireless network needed for installation. no activation, or license to buy. it comes loaded with some common apps. what the documentation does NOT say if third party apps like web browsers or pdf readers can be installed either windows or linux versions. can this be done and how? I have tried a "windows" like version installed from a cd but found it clunky and other apps I would prefer were either not included in the "repository" or not available . I know linux and windows are not compatible and I found installing linux apps from the repository did not always work. does anyone know if this is a product worth trying? some reviews say it comes on a CD which can be used to use it from the CD without installing it or install it later. other reviews say only the stick is used with no choice NOT to install it. if it is not plugged in to a usb port than of course it is not being used. it must be reinstalled on the same computer every time it's needed, I think. any advice welcome.