The procedure for buying and selling dematerialised shares is similar to the procedure for buying and selling physical shares. The difference lies in the process of delivery (in case of sale) and receipt (in case of purchase) of securities.
In case of Purchase
The broker will receive the securities in his account on the payout day. The broker will give instruction to its DP to debit his account and credit your account. You will give Receipt Instruction to DP for receiving credit by filling appropriates form. However you can give standing instruction for credit into your account that will obviate the need of giving Receipt Instruction every time.
In case of Sale
You will give delivery instruction to DP to debit your account and credit your broker’s account. Such instruction should reach to your DP’s office