Commodore 64 User Manual page 26

FUNCTION KEYS
The four function keys on the right side of the keyboard can be "pro-
grammed" to handle a variety of functions. They can be defined in
many ways to handle repetitive tasks.
CTRL
TheMkey, which stands for ConTRoL, allows you to set colors, and
perform other specialized functions. You hold the =key down while
depressing another designated key to get a control function. You had an
opportunity to try the= key when you changed text colors to create
different color bars during the setup procedure.
RUN/STOP
Normally, depressing the key will stop the execution of a
BASIC program. It signals the computer to STOP doing something. Using
l
16