Download Quiet.zip, a freeware application from www.joeware.net.
When you use quiet.exe to launch an application, it is hidden from the taskbar. The application will appear as a process in Task Manager.
Quiet V01.00.00cpp Joe Richards (firstname.lastname@example.org) October 2001
NOTE: Logging off will kill the process, as it isn't hidden from the system.
NOTE: If quiet can't find the application to launch, a dialog box appears.