The 4 letter one yeah (¯Õ)
Never mind... The thing is randomly generated and it won't accept it as a valid ID.
No its not randomly generated, and title IDs are not 4 letters. ASCII representations of title IDs are 4 letters. The actual title ID is 8 (well, 16 if you count the 00010002 part, which just defines it as a channel essentially) hex digits. And it is, for latest HBC, 0xaf1bf516. So the full thing for the above code would be:
CODEWII_LaunchTitle(0x00010002af1bf516ULL); //Change this line to title ID