Asynchronous input definition
Asynchronous input is one of the two basic operating modes of any special input stream (synchronous and asynchronous input). In asynchronous mode, natural input transactions do not have to be synchronized or interlocked with the input state of a program. For example, a user or a typist should be allowed to enter information into the system in advance to perform read states that can use them. The execution of each read state simply removes the next wait message from an input buffer.