Using (calling) other contracts on the chain:
From your contracts, you can call other contracts on the Ethereum blockchain . Of course calling other contracts involves gas cost. How much gas? The calculation of the gas can be complex. You can read documentation about it but the short answer: Studio will show you the total gas so you have pretty good estimate.
Oraclize is the latest smart contract data engine. It allows you to include external data sources into your smart contracts. "Oraclize is a provably-honest oracle service enabling smart contracts to access the Internet." Now Oraclize can be easily integrated into Ethereum Studio IDE. read more