I realize that no one else may be using the Symbolic Debugger (SD: - specifically SDHX.SYS) in RT-11, but there is an enhancement that should be helpful and I could use some advice. This question will probably receive opposite answers since this group is so diverse. BUT here goes: The questions is (as described below): "Should all 6 possible SET commands be available or is that too confusing to the user and only the first 4 SET commands should be available?" In RT-11, a user program can issue an EMT request so that RT-11 allows the user program to handle TRAPs to locations 4 and 10 so that special expected error conditions can be handled correctly. However, in the RT-11 Symbolic Debugger, these TRAPs are again over-ridden unless the user again forces them back to the user program with the commands: _T4;V let the user program handle TRAPs to 4 _T10;V let the user program handle TRAPs to 10 For turning off either selection (if either was selected), the command is: ;V turns off both TRAPs to 4 and 10 Unfortunately, the DEC version Y01.16 of SD: always required the user to first activate the Symbolic Debugger in order to execute one or both of those commands. However, by adding two additional SET commands to the SD: code, the user can use these SET commands (even in a command file to automatically initialize everything) before the SD: code is even LOADED and activated, as for example: SET SD: T4 - equivalent to _T4;V SET SD: T10 - equivalent to _T10;V Turning off the selections uses the commands (the commands are only almost equivalent to ;V): SET SD: NO T4 - ONLY turns off _T4;V SET SD: NO T10 - ONLY turns off _T10;V Of course, it is also possible to have two more SET commands which: SET SD: TRAPS - equivalent to both _T4;V and _T10;V SET SD: NO TRAPS - equivalent to ;V The questions is: "Should all 6 possible SET commands be available or is that too confusing to the user and only the first 4 SET commands should be available?" By the way, although it is not very useful to re-implement the current SET commands so that the change is applied after the LOAD SD: command has been executed, it is possible to add code to the "SET SD: T4" option which changes both the SY:SDX.SYS file and any copy which is in memory. This allows the user to execute "SHOW CONFIGURATION" without having to first "SET SD: BREAK". In addition, the "SET SD: T4" command can then be done either before or after the "LOAD SD:" command. Another other comments or suggestions would also be helpful. Jerome Fine