
Expression operators:

     NOT : logical NOT

     AND : logical AND            \  ANDs and ORs may not be mixed
     OR  : logical inclusive OR   /    in the same expression

     EQ, NE : EQuals,          is Not Equal to
     LT, LE : is Less Than,    is Less than or Equal to
     GT, GE : is Greater Than, is Greater than or Equal to
     IN, NI : is contained IN, is Not contained In
     CO, NC : COntains,        does Not Contain

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Sirius functions have Boolean (TRUE/FALSE), integer, or string values:

     Boolean functions
     ~~~~~~~~~~~~~~~~~
     Msg flags:  @Private        @Xpress        @Received     @Sent
                 @FileAttach     @InTransit     @Orphan       @KillSent
                 @Local          @Hold                        @FileReq
                 @ReceiptReq                    @AuditReq     @UpdateReq

     Other:      @FromYou  \ message is From or To anything matching
                 @ToYou    / your main-menu "You" string(s)

                 @NoBody   -- message file size <= 191
                 @ReadOnly -- message file cannot be altered or (re)moved

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     Integer functions
     ~~~~~~~~~~~~~~~~~
                 @DaysHere -- number of days msg has been on this system
                 @DaysOld  -- number of days since msg was authored

                 @FileSize -- number of bytes in msg file

                 @HighMsg# \
                 @LowMsg#   \
                 @Msg#       > (inor current msg area)
                 @MsgCount  /
                 @Zenith   /

                 @NetFrom     @NetTo     @NodeFrom     @NodeTo

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     String functions (case-INsensitive)
     ~~~~~~~~~~~~~~~~
                 @From     =  msg file bytes    1- 35
                 @To       =   "    "    "     37- 71
                 @Subject  =   "    "    "     73-143
                 @Header   =   "    "    "      1-190
                 @Body     =   "    "    "    191+
                 @Msg      =  the entire msg

                 @Keyin   --  whatever was last keyed in response to
                              a Sirius "In" command (initially null)

