A list of functions that are called when a CAPI interface is created or destroyed. This variable is deprecated.
Each function in the list *update-screen-interfaces-hooks*
is called when an interface
interface
is created or destroyed.
Each function takes two arguments: the screen and interface .
You should not remove system functions from this variable so take care if setting its value. Only add or delete your own functions.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017