It is not a diary the most people have rather a *scratch* Emacs buffer. It keeps notes about everything related to Linux, Open Source, UNIX, MacOSX and software engineering.
DT login manager is an annoying program runs by default on Solaris8 boot. Many legacy SPARC computers are connected to non-Sun monitors these days, so it makes very difficult sometimes to run graphical login window and login from the main console. Legacy text login still works indeed.
It is not obvious were dtlogin starts at boot time. inittab does have any entries to run any login managers.
rc3.d/ does not have anything useful and
rc5.d may be missing. Here the magic command to disable and stop DT login manager:
/usr/dt/bin/dtconfig -d remove DT login manager from boot sequence;
/usr/dt/bin/dtconfig -kill kills existing instance of DT login manager.