ODT has been modified to have the two 'lurking debugger' modes which are also found in DDT. The object file should replace [1,1]ODT.OBJ. Any prospective user should also read DDTAPP.DOC. The file ODTASM.CMD is used to assemble ODT. D.LURK is a switch which may be used to drive ODT in one of two invisible automatic start modes. This switch is assembled as a 0. It may be ZAPped to a non-0 value other than 2,in which case ODT will suppress its initial typeout and execute an automatic G, starting the user task. Since ODT has been used (although invisibly), its traps will be set. If D.LURK is set to 2, ODT becomes completely invisible and the automatic G is performed without the ODT traps being set first. This prevents ODT from interfering with FORTRAN run-time error handling, which also uses the SST's. Feedback from other users or potential users is welcome. Please direct this to: Fred Isaacs PHONE: 617-272-7070, x441 Supervisor, IC Applications Group Engineering Department Applicon, Inc. 32 Second Ave. Burlington, MA 01803