The FSA is also considering action in other facets of disclosure including a restriction of lending of stock securities in rights issues. (newlawjournal.co.uk)
These identifiers are mostly important for bonds and other non-common stock securities (like the preferred shares above), because there is typically a lot more different issues. (financialcanadian.com)
I still have my US E * Trade Financial Global account and Schwab account that are all Canadian stock securities. (canadiancapitalist.com)