This holds settings for the key binding mechanism. Calling brlapi_getTty() with it will load bindings from file "$HOME/BRLAPI_HOMEKEYDIR/client-xy\#\#BRLAPI_HOMEKEYEXT" where xy is the driver code, as returned by brlapi_getDriverId()
"$HOME/BRLAPI_HOMEKEYDIR/client-xy\#\#BRLAPI_HOMEKEYEXT"
xy