You didn't /have/ to really. I was a mac developer for 20+ years, and I never did 'register' them officially... even pretty big commercial apps wouldn't -- it w

You didn't /have/ to really. I was a mac developer for 20+ years, and I never did 'register' them officially... even pretty big commercial apps wouldn't -- it was easy enough to have a unique sequence; one of the basic rule was that all lowercase ones were Apple. I always thought that the 'creator codes' and other use of that four character sequence system was a great feature. It was gradually lost with osx. Fun fact: All compilers for Mac had language extensions to deal with four character sequences, like 'AbCd' in C would be an integer with ('A'<<24)|('b'<<16)|('C'<<8)|'d'. Beats 0xdeadbeef and 0xcafef00d!