Int 67  - Cuckoo.com - Installation Check                                  [U]

Program: CUCKOO is a resident on-screen clock with optional hourly chime or
     cuckoo by an unknown author with revisions by Thomas A. Lundin

Note:  this is not a vector; when loaded for the first time, CUCKOO.COM uses
     the last unused (0000h:0000h) vector in the range 60h-67h to store
     the signature value 434Ch:4F4Bh ('CLOK')