From 6u10 b23, importing a jnlp appln with user cache and system cache doesn't update registry and the appln is not listed in add/remove programs.

Till b22, following was the behavior :

User cache
========
   -> import notepad appln(javaws -import http://java.sun.com/products/javawebstart/apps/notepad.jnlp)
   -> it is available in add/remove programs list
   ->also in registry, this application is listed under HKEY_CURRENT_USER\software\microsoft\windows\currentversion\uninstall
   ->now javaws -uninstall, uninstalls the appln. so entry got removed from registry and add/remove programs
system cache
===========
   ->import notepad appln using system cache(javaws -system -import http://java.sun.com/products/javawebstart/apps/notepad.jnlp)
   ->it is available in add/remove programs list
   ->also in registry, this application is listed under HKEY_LOCAL_MACHINE\software\microsoft\windows\currentversion\uninstall
   ->now javaws -system uninstall, uninstalls the appln from system cache. so entry got removed from registry and add/remove programs