To associate an accelerator key with a given window.
SUBROUTINE ADD_ACCELERATOR@( W, KEY_NAME, F ) INTEGER(7) W
This associates the callback function F with the named key (see the definition
of %ac in Accelerator key
format for details of the names of keys). W is the handle of the window
which you can obtain using %hw when the window is created. If a previous
accelerator definition for this key in this window exists then it is removed.
You could use this routine if you were writing a configurable editor and you
wished to change the accelerator definitions of the surounding window
The call-back function cannot be a string representing a standard call-back.