Ok... I hope this may work by QList<>.
In my new connection slot I need to try like
QList<QTcpsocket*,sockets>=new QTcpsocket.
But after declaring as aQList.we have to set socket descriptor or not required? Then we can try to sendtoall().

Okay now this may work for data to all the clients.... As mentioned above post if I need to send data for specific client.not suddenly at the same time to respective client who has sent data to server...later also...how this process will happen?