A screen driver is included with other drivers provided by a vendor with a
computer system The screen driver is picked up by the OS along with the
other drivers at the beginning of the installation of the OS. The screen
driver remains dormant until the first time a user logs into the computer
system. At that time, the driver executes and retrieves screen data along
with a program that displays the screen. The program also maintains the
displayed screen on top of any other screens that might be generated
subsequent to completion of the first log-in to maintain visibility to
the user until the user has an opportunity to act on the display screen.