The programming methodology in which the task will not wait for the terminal users response, but frees and resources after sending the message is call a PSEDUDO Conversational Technique. Terminating the task every time the application needs a response from the user and then starting the next transaction when the user presses a attention key is PSEUDO Conversational Processing.
Generally the I/O request requiring a user input takes 1000 times more time than CPU processing time. So, the idea is to free the current CPU resources till the user gives his response and initiate the same after receiving the response from user. In the meantime, CPU engages itself in processing other programs/transactions. This helps multitasking concept and hnce faster and concurrent processing.