multichart with IB datafeed : root symbol

I am currently using MC with IB datafeed to trade futures.

I would like to have the US stocks, ie, IBM feed into MC.

Can someone please tell me the root symbol that I am supposed to use on the "symbol root" on the quote manager ?

I've tried "IBM", but it doesn't work. is it "IBM US" or something ?

similar questions, for HK stocks, 949 HK. what root symbol should I use ?

many thanks...
 
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