Application programs can define the action that occurs when 
anyone 
of 
the PF 
keys 
is 
pressed. 
By 
doing this, each program can tailor 
the 
keyboard 
to 
fit its 
specific needs.  This adds flexibility 
to 
the 3278 keyboards and makes them 
more powerful input devices. 
One program might replace the document 
on the screen with a different one whenever 
PFI 
is 
pressed with the ALT key 
held down.  When you are working with a different program, pressing 
PFI and 
ALT might be a signal that 
you 
have keyed in 
all 
the source data that you have 
available. 
To determine the use 
of 
each 
PF 
key and the action it causes, ask the appropriate 
person in your organization how the 
PF keys are used 
or 
refer 
to 
the appropriate 
user's program guide. 
Note: 
The 
PF 
keys 
are 
typamatic when held down; however, it 
is 
recommended 
that 
you 
do 
not 
use the 
PF 
key 
typamatic capability, because the results 
are 
unpredictable. 
PF13-PF24 Keys 
The PF13 through PF24 are keys 
that 
your keyboard 
mayor 
may not have. 
They serve the same function as the 
PF 
1 through 
PF 
12 keys.  However, they are 
not alternate function keys, and you do not use the ALT key when you press 
them. 
Chapter 
3. 
Keyboards  3-15