How to Enable or Disable Print Job Notification Messages

Introduction:-By default XP notifies a user with a popup message that the print job has been completed on the printer.This may be an annoying pop up to certain users.

How to disable "the document is being printed" balloon or,pop up message:-

To disable this balloon message,click Start,go to Printers and Faxes,click File ,select Server Properties ,click Advanced tab.Here you uncheck the boxes against:-
"Show informational notifications for local printers" and
"Show informational notifications for network printers"
Click Ok/Apply.

How To Enable or,Disable this pop up through the Registry:-

Start>Run>Regedit>OK

Now navigate to the following registry location:-
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Providers

Highlight Providers and find out a Value Name: "NetPopup" in the right pane.If it is not there then create a new DWORD value:-"NetPopup"
Now set the value data as below:-
0=disabled
1=enabled

Close the registry editor ;restart the spooler service and reboot the system.

Furthere Reference:-
How To Enable or Disable Print Job Notifications in Windows XP
http://support.microsoft.com/kb/308217/