Which type of computers do Indian Railways use to interact with the customers for the various online functions, like booking, cancellation, showing the current status and so on?

I am a perfect combination of Analog and Digital computer. I accept analog signals, convert them to digital and process them in digital form. Who am I?

Ms Khanna is a professor of English in a university. She has to keep herself updated with the latest research in her field. She is not comfortable in using a keyboard. Which type of computer will you suggest her considering the nature of her job and preference?

I am a component of CPU which performs logical operations. Identify me.