Currently Being ModeratedDec 5, 2012 12:40 AM (in response to pratheep kumar)
Users on your computer are totally different from users in the iTunes Store (which are based on Apple IDs), if that's what you're talking about. And iTunes has nothing to do with installing Applications, nor is there a different System folder for different users. So your question is rather confusing.
Can you explain in more detail WHERE you're seeing this user name, how you're installing applications and exactly where they're ending up?