With respect to your first question on the internal trade agreement, it is not solely on the internal trade agreement that a complainant, a Canadian supplier, can come before the tribunal. He can come under NAFTA, and he can also come under the WTO agreement on government procurement. The three avenues are open to him for a Canadian procurement, for a call for tenders by a Canadian department.
NAFTA and the WTO have similar criteria. NAFTA inspired the WTO agreement on government procurement. The criteria are practically the same, and the exemptions are also close. The Canadian agreement on internal procurement is slightly different.
But to answer your question specifically, a supplier could come under the three.