I ran Services.msc and disabled the "DW WLAN Tray Service" (description: Provides automatic configuration for the 802.11 adapter using the Broadcom supplicant.). The Peernet icon disappeared from the tray and wifi continues to work as it did before. The other alternative is to uninstall Dell's drivers and this utility entirely and install a basic wireless driver that doesn't include PeerNet.
I am setting up a new Inspiron 15R for a novice user.  There is an PeerNet icon which I learned is a method to connect to another computer (perr-to-peer).  As this is a potentially dangerous utility, I want to either get rid of the icon or uninstall it. It appears to be part of Dell's DW WLAN Card Utility (whose tray icon can be disabled). I don't want the user to have the ability to access PeerNet.  Is there a way to disable the icon?  
Can PeerNet of DW WLAN be disabled?