Dear first of you all, if you have received PER, and did not hear back from you VO then you may want to use it (specific to your VO) for providing them update. However, the appropriate and the best way (that every body does) wait for the first communication from respective Visa office. Once, they communicate you e.g. for your MR etc, they will provide you with request to provide them updated information chart at that time you can send them addendum and the same I did so telling you practical and personal experience.
Hope that helps
Good luck!
Thanks for replying. But the confusing thing is that this link is not specific to any visa office. Other links clearly states the visa office. this is what is causing the confusion. For example, for Lebanon there is a separate one called case specific enquiry - Lebanon. But this link has no connection to any visa office which makes me think it can be used to contact CIC. I am not really sure.