Mail is the single program in this directory.  Its argument specifiesthe mail box to read, default /mail/box/$user/mbox.For example, running	Mail /mail/box/$user/stored(a line in the guide file) looks at saved mail. Mail maintains a window containing headers for all themessages in the mailbox and monitors the mailbox for new messages.Using button 3 to indicate a message number opensa window on that message.   commands in the mailbox window are	Put		Write the mailbox back to the file (never done automatically)	Mail		Make a new message window ready to mail someone.			Takes argument names analogously to acme's New.	Del		Exit Mail, after checking that mailbox isn't modified.New messages appear at the top of the window and are highlighted upon arrival.(The messages are numbered oldest to newest, the opposite of regular mail.) Message windows have a simple format: the first line, up to the first tab or newline,holds the sender or, when sending, the addressee.  Edit the line to change who themessage goes to.  Message windows contain the commands	Reply	Make a new window to compose a reply to this message	Delmesg	Delete the message from the screen and from the mailbox	Del		Delete the window, leaving the message in the mailbox	Post		Send the message to the addressee	Save		Save to the named mailbox, default/mail/box/$user/storedSave takes a full file name; if that name has no slashes, the file is takento be in /mail/box/$user and must already exist. Use mkbox in the guide tocreate target mailboxes in /mail/box/$user.Reply and mail windows contain an obvious subset of the commands.