The foreign nationals need documented permission called a temporary resident visa (TRV), to enter into Canada. It is official counterfoil document issued by a Visa Officer that is generally placed into the passport of the person concerned. This confirms that this person has met all the requirements for admission to Canada as a temporary resident. But it is not a guarantee to enter Canada. The admission of a foreigner into Canada as a temporary resident is a privilege, not a right.
A foreign national can enter Canada on TRV with dual intent as well. Having two intentions, one temporary residence and one for permanent residence is legitimate as per IRPA A22 (2). Dual intent is present when a foreign national who has applied for permanent residence in Canada also apply to enter Canada for a temporary period as a visitor, worker or student. Dual intent on the part of the applicant is therefore not a prima facie ground of temporary resident status.