yes i can help 
EMC is one of the Reg SHO pilot stocks therefore there are no short sale restrictions...
what you are waiting for on NOK is someone who is long to sell into the bid, then you can put your offers up...
eg. nok is 15.89 x 15.90...
15.89 wiped out...
new nbbo is 15.88 a 15.90 and you can't SS at 15.89...
someone has to hit 15.88 before you can post SS offers at 15.89... sometimes I will buy 100 shares at 15.90 and sell them to 15.88 so I can post my SS's at 15.89....
hope that helped...
mnx

EMC is one of the Reg SHO pilot stocks therefore there are no short sale restrictions...
what you are waiting for on NOK is someone who is long to sell into the bid, then you can put your offers up...
eg. nok is 15.89 x 15.90...
15.89 wiped out...
new nbbo is 15.88 a 15.90 and you can't SS at 15.89...
someone has to hit 15.88 before you can post SS offers at 15.89... sometimes I will buy 100 shares at 15.90 and sell them to 15.88 so I can post my SS's at 15.89....
hope that helped...
mnx
Quote from Szeven:
The funny thing is some stocks allow crossing down into the bid and some dont in my experience. For instance as you know i trade EMC everyday, and i can cross down to the bid on any ECN or the specialist at any time. Im not sure why this is, but there is no restriction whatsoever about crossing down to short.
Other stocks that i trade sometimes (EP, L, GLW, NOK) dont allow this and lots of the time (NOK in particular), you can even short at the offer for quite a few seconds. Im not sure what needs to take place in this situation, but if the bid and ask move down 1 cent you cannot even place orders short at the offer. Maybe someone could clarify this for me.