> It says I can apply for a work or study permit if I don't
> already have one, so does that mean I have approval in
> priciple ?
Yes! That phrase is specific for AIP letter: you now have first
stage of approval.
> The letter doesn't use that term anywhere and just says work
> permit, not open work permit.
Yes! That's how it is.
> do I need anything to else to apply for OHIP,
You need to call CIC to get them send you medical approval
letter. You need it to apply for OHIP.
> SIN, and Open Work Permit ?
You applied to change your status to "work permit". Use this
package:
http://www.cic.gc.ca/english/information/applications/visitor.asp
(include copy of the AIP letter as eligibility proof)
After you get your work permit, then you can apply for SIN.
> Also, it says a final decision won't be made until medical
> results and background checks are passed... but I sent both of
> these in with my application.. (official recipt stating I
> completed medicals, and a police certificate from the
> Australian Federal Police)...
Standard statement for medical. Background security check is not
limited to police certificate, Canada will use intelligence
services to do deeper check.
> are they likely to make me re-do the medicals ?
Only if the previous one close to expiration (1 year after check
up) and your case does not seem to close to completion.

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(stephan paul) Arif Sahari Wibowo
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Disclaimer: IANAL, IANALP, IANAMD, IANAMP, IANAAP
my statements - if any - should be treated as such.