Right now, imports and exports are tracked under the three programs: the controlled goods program, the Export and Imports Permits Act, and the automatic firearms country control list. Effectively, as a Canadian, when you export, you are tracked into which regimes you are selling your goods and services.
What the UN ATT will do is look at the third parties that are acting as agents or brokers, which is that extra layer of movement of goods and services between countries, from country to country, by an agent or a third party. That additional activity is heavily targeted on the movement or diversion of defence goods and services between nation-states and between organizations and persons.