How can i invoke 'konsole' automatically after KDE comes up after booting? That is, is thr any way that i can do so i can make a program as load automatically?

~/.kde/Autostart

In this case, the konsole will execute for a single user. If i want to execute that for every user, then how can i do it?

The 'konsole' is an X-Windows terminal program. Do you want the shell to pop up when someone logs in, or do you want a program to run in the background whenever someone logs in. The proper place for a startup program depends on what the type of program it is (shell, x-windows, kde, gnome), when you want it to run (when someone logs in or only if x-windows is running).

info bash will provide information on bash startup scripts such as the profile, bashrc, bash_login, and bash_logout scripts. Bear in mind that some users will not run x-windows at all, and some users will use the c shell while others will run the korn shell. Also, many distros will have one of the startup scripts source one of the others if they exist. Read through them on your system. For example, for system wide aliases, Mandrake Linux will source an alias.sh file, so for simply setting system wide aliases, this is where you would make those changes.