there are 23 pf keys and 3 pa keys and one one enter key and one clear key
they are there in original IBM keyboard,
but we use normailly the pc key boards only for any thing so no need to
worry about all the keys other than pc keys
and use only those.
as we use only the active part of the IQ, no need to use all, but use the gray part of it.
use of these keys is with online or interactive part of mainframes
that is CICS
copy the DFHAID into the working storage section of the application program.
then use them like this
then do some....
like this use any of the keys for the application process.