INT 67 - CUCKOO.COM - INSTALLATION CHECK
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')