JimBrown on "Enabling debug code"

I've searched the site but didn't find any info on this.

Are there instructions somewhere on how to globally enable the built in debug code? Or to selectively enable the debug code in specific files or functions?

I've been looking at 1.4.6 and have been inserting my own debug code (using debugLog() ) but noticed there is built in debug code that I'd like to use.

Thanks,
...jim