Epson ActionDesk 4000 User Manual page 54

You can change the processor speed temporarily by entering
one of the following commands from the numeric keypad on
your keyboard:
To select slow speed, press Ctrl Alt and then press the -key
on the numeric keypad. This turns off the speed light.
To select fast speed, press Ctrl Alt and then press + on the
numeric keypad. The speed light comes on.
N o t e
You can use the commands listed above while you are
running a program. However, if the program uses one of
these commands for another function, you cannot use it to
change the processor speed.
The speed setting remains in effect until you do one of the
following
Reset your computer
Turn off your computer
Change the speed with another keyboard command
Change the jumper setting of J22 (as described in
chapter 4).
Using Your Computer 3-9