1 09/21/82  read_mail request:  previous
 2 
 3 Syntax:  previous {-control_arg}
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 5 
 6 Syntax as an active request:  [previous {-control_arg}]
 7 
 8 
 9 Function:  prints the message number of the last message of the
10 specified type before the current message; as an active request,
11 returns the message number.
12 
13 
14 Control arguments:
15 -include_deleted, -idl
16    prints or returns the message number of the last message before the
17    current message whether or not it has been deleted.
18 -only_deleted, -odl
19    prints or returns the message number of the last deleted message
20    before the current message.
21 -only_non_deleted, -ondl
22    prints or returns the message number of the last non-deleted message
23    before the current message.  (Default)
24 
25 
26 Notes:
27 If there are no messages of the specified type or there is no current
28 message, the active request will return the value zero.