It has taken some effort but I have managed to find out the information!
In the MSN Bridgeclub on the Zone there are some restrictiions on allowed systems. They are jolly difficult to find because instead of having a helpful heading like "Permitted conventions" or something you have to look at the Alert Chart and they are at the end!
Brown Sticker conventions are not permitted. It goes on to describe Brown Sticker conventions, so for details I should take a look for yourself, but anyway that means RCO openings are not allowed in the Bridgeclub.
The website is athttp://www.msnbridgeclub.com/default.htm
and you should look for the alerting rules.
If you play in the Zone generally, NOT
in the Bridgeclub, then there are no restrictions on what you may play.
I hope this helps!!!!!