In combination with hander.interface.asm (supplied), lets a user trap
keyboard or mouse events before they get to Intuition and if desired,
install new (phony/ generated/other-devices-mouse-simulations) into the
input stream.  Handler.interface.asm is needed to convert the calling
sequence performed by the input.task for the input stream management into
something that a C program can understand.  

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  940    1915  49.1% -lh5- 0d1b Jan 11  1986 input.dev/handler.interface.asm
[generic]                 4065   10079  40.3% -lh5- 8bc6 Jan 11  1986 input.dev/input.dev.c
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    5005   11994  41.7%            Jan 11  1987