Nasdaq

#1
I would planning to invest in nasdaq in the near future so i have got a few queries...
do ameritrade,firstrade,etc brokerages allow us to buy ALL the scripts or are they like indiabulls where yu cant buy z-scripts?
is it better to invest through indian brokerages or american?
a person cant invest more than 20000$ abroad a year.....what are its implication on shortselling?
How are the US tax levied on short selling....

i guess thats all for now..:D
 

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