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The details are hidden in the DB_COMMAND(cmd_name, func_name) and DB_SHOW_COMMAND(cmd_name, func_name) macros. DB_COMMAND() adds to the top-level ddb command table and DB_SHOW_COMMAND adds to the `show' subtable. Most external commands will probably be `show' commands with no side effects. They should check their pointer args more carefully than `show map' :-), or ddb should trap internal faults better (like it does for memory accesses). The vm ddb commands are temporarily unattached. ddb.h: Also declare `db_indent' and db_iprintf() which will replace vm's `indent' and iprintf().