HP 3000 Manuals HP 3000 Manuals
Definition of Mail
Information transferred between processes is referred to as "mail." It is
sent from one process to another through an intermediate storage area
called a "mailbox." At any given time, a mailbox can contain only one
item of mail (a "message" ). For any process, there are two sets of
mailboxes:
* The mailbox used for communication between the process and its
parent; each process has one of these.
* The set of mailboxes used for communication between the process and
its children; each process has one of these mailboxes for each of its
children.
Even though there are two sets of mailboxes, there is only one mailbox
between any two processes.