QUESTION 3:
Do you think it is possible for a program to use several input and several output streams?
Yes. One program can be the source of the stream and the other program can be the destination.
A stream that connects two executing programs is called a pipe. To one program the pipe is an output stream; to the other program it is an input stream.
There are many types of IO devices. Some can be a source, others can be a destination, and others can be both source and destination. Often the destination for one stream is the source for another. In the table, decide what role each object can play.
Some objects switch roles depending on what program is running. For example a disk file might be the destination for the output of one program, and later it may be the source for another program.
Do you think it is possible for a program to use several input and several output streams?