Loula,
when you sponsor your spouse the sponsor will receive an 8 digit Client Id number with CIC. Once the application reaches Haiti and they start processing they will assign a "B" File number.
If you are on the CIC Client Application Service (CAS) site you can enter your Client ID number and your name, DOB and birth country. You should see whether a decision has been made and the status of your spouses application. Do not put too much stock in this website as when I look under my ID it remains "not available" for my husband. (They started processing on Jan 31).
If you ever receive the BFile number from Haiti - they will likely not tell you even if you request it - then you can enter the BFile number and your spouses name, DOB and birth country. You should then see when they started processing the application.
That's all it tells you. At the beginning of the process I looked at the site and read up on all the information. I was under the impression that the website would be updated through the different process steps and you would have an idea of where your application was. This is not the case. I'm pretty sure that they will never update the website under my ID and my husband will have a visa in his passport and it will still say unavailable.
It's very frustrating but I don't think Haiti will start providing updates any time soon. Hope the explanation helps