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 A multi-user operating system may  have several users logged in at once.
                          -----------------------------
                          |                           |
                          |                           |
                          |                           |
                          |         COMPUTER          |
                          |                           |
                          |                           |
                          |                           |
                          -----------------------------
                          -----------------------------
                          |                           |
                          |                           |
                          |                           |
                          |         COMPUTER          |
            --------------|                           |----------
            |             |                           |         |
            |             |                           |         |
            |             -----------------------------         |
        -------------                    |                ------------
       /           /                     |               /          /
      /   User    /                      |              /   User   /
     /     1     /                       |             /     2    /
    -------------                        |            ------------
                                   --------------
                                  /            /
                                 /    User    /
                                /      3     /
                               --------------
                   Under a multi-tasking operating system a user
                   may run more than one program at one time.
                          -----------------------------
                          |                           |
                          |                           |
                          |                           |
                          |         COMPUTER          |
            --------------|                           |----------
            |             |                           |         |
            |             |                           |         |
            |             -----------------------------         |
        -------------                    |                ------------
       /           /                     |               /          /
      /   User    /                      |              /   User   /
     /     1     /                       |             /     2    /
    -------------                        |            ------------
                                   ------------------- cc
                                  /            /
                                 /    User    /---- grep
                                /      3     /
                               ------------------- vi