When WebRunner opens a webapp bundle it will unpack it into the '''webapps/{webapp-id}''' folder in your WebRunner profile. The webapp web application may save other data into this folder. WebRunner will not overwrite or delete any extra data added to the folder. In fact, WebRunner saves some extra data itself - a file that holds some persistent UI data called ''localstore.json''.
<div class="note">The webapp must have an ID in order to be installed.</div>
When WebRunner is launched with a "-webapp [bundle]" command line, the bundle must first be unpacked before the web application is launched. This can slow the overall launch time and the unpacking is redundant if the bundle has been launched previously. This is why the preferred method of launching is to use the "-webapp [webapp-id]" which looks for the previously installed (unpacked) web application in the WebRunner '''webapps/{webapp-id}''' folder. The web application is then launched without the unpacking overhead.