I hope this helps this was what i got from rbc some time ago
Re: Brokerage Shenanigans/reply from RBC
in response to posted on Sep 23, 08 11:59AM
Dear Mr. xxxxxxxxx
In reference to your email, please note that we will not short-sell any positions held in a client's accounts that are fully paid for.
Under IDA Regulation 2200, we are not allowed to loan fully paid securities.
Mr. xxxxxxx thanks for contacting us. If you'd like more help with anything, just ask in a reply to this e-mail, or call us at 1-800-769-2560, Monday to Friday, from 7:00 a.m. to 8:00 p.m., Eastern Standard Time.
Thank you for choosing RBC Direct Investing.
Feda Boustany
National Client Liaison Team
RBC