am going through your URL just tell me is this entry will work or not
T0:2345:respawn:/sbin/agetty -L ttyS0 38400 vt100
Looks like that or a variation should work.Sorry to redirect you to more articles
Red Hat and agetty could be slightly different than the Debian and getty I am used to.
As you see there are slightly different suggestions in the different articles for agetty. There should be enough info to help you try a couple if one does not work.
note: sometimes I was able connect through minicom but no login prompt provided from hyper terminal can't see anything
but if I type something in the HyperTerminal it will appear in the minicom screen
This makes me wonder about your setup.
For the serial connection the computer you are adding the getty line to will be the "server" and you do not open a terminal emulator on it. You do open the emulator on the computer you are using as a "client". It seems you are trying to have the two terminal emulators "talk to each other". AFAIK that is not correct.
If your laptop runs only Windows 95 you would use Hyperterminal or any prefered terminal emulator to connect to the Red Hat "serial server" when the login getty is working.