MAIL$MAILFILE_OPEN

   Opens a specified mail file for processing. You must use this
   routine to open a mail file before you can do either of the
   following:

   o  Call any mail file routines to manipulate mail files

   o  Call message routines to read messages from the specified mail
      file

   Format

     MAIL$MAILFILE_OPEN  context ,in_item_list ,out_item_list
 

Additional information available:

Returns         Arguments       Input_Item_Codes
Output_Item_Codes               Description     Condition_Values_Returned