Throwback protocol (client end)

To use throwback (as a client) you need the DDEUtils module and an editor which supports throwback. There are three SWIs:

DDEUtils_ThrowbackStart (&42587)

Entry: Don't Care

Exit: All registers preserved

Function: Start a throwback session

DDEUtils_ThrowbackSend (&42588)

       R2-R5 variable

       R0 = 0 (Throwback_ReasonProcessing)
       R2 = pointer to full pathname of file (null terminated)

       R0 = 1 (Throwback_ReasonErrorDetails)
       R2 = pointer to full pathname of file (null terminated)
       R3 = error line number
       R4 = severity:
          = 0 for warning
          = 1 for error
          = 2 for serious error
       R5 = pointer to error description string (null terminated)

       R0 = 2 (Throwback_ReasonInfoDetails)
       R2 = pointer to full pathname of file (null terminated)
       R3 = line number to which info message refers
       R4 = 0
       R5 = pointer to informational message (null terminated)

Exit: R0-R4 preserved Function: Call once with reason code 0, and then with code 1 or 2 for

          each error/message

DDEUtils_ThrowbackEnd (&42589)

Entry: Don't Care

Exit: All registers preserved

Function: End a throwback session

All three SWIs can give errors of "No task registered for throwback" and "Throwback not available outside the desktop" (no error numbers given).