The Debug system is in locale jdebug. This is read in as follows:
load 'system\extras\util\debugs.ijs'
Debug is enabled when suspension is set on (dbr 1), and the debug latent expression (dblxs) is set to run debug in the jdebug locale, with an argument of the current locale name, i.e.
dblxs 'debug_jdebug_ coname$0'
You can set suspension mode or the latent expression under program control.