Nowadays, most brokers offer you access to your trading account and demat account through a single platform. Typically, it is seamless and totally online. There is nothing offline involved and hardly any physical paper moves in most cases. Your funding of the bank account, credit to demat accounts, debits to the demat accounts and credits to your bank account all happen seamlessly. Ensure that the DP has a robust technology platform that ensure that your entire demat process happens in a smooth way. Typically, when you sell shares, the demat account gets debited the next day and if you buy shares the demat account credited on T+2 day. A DP with a strong sense of technology will ensure that these processes are conducted very smoothly.