After the installation of the iPrint client,v.02.02, the client prompts
you to randomly authenticate if you do not choose to save the
authentication credentials. You will get prompted every time the machine
starts up (which is fine) but sometimes it will pop-up when you are
browsing the internet, typing a document, etc... iPrint is running on a
Netware 6.5 box and this problem happens on all versions of the Windows OS.