text:  And Samira Hussain in Delhi. We'll come back to this huge story affecting computer systems across the world shortly. It's the BBC World Service with Andrew Peach. Now, the most powerful man in Vietnam, the head of the Communist Party, has died at the age of 80. We were talking only yesterday about how responsibilities were being moved around the people at the top of the Vietnamese government. Asia-Pacific editor Michael Bristow is back with me in the newsroom. First of all, let's talk about the head of the Communist Party and how he'll be remembered.