More adventures in computing!

Recently(approx 1 month ago),I installed Firefox,and Thunderbird on my RedHat9 system. I installed it in the /usr/bin directory,and since I haven't gotten around to adding a path,I can't run Firefox from the desktop-I still have to open a terminal window,and change to the /usr/bin directory,and start the browser from there.

My quesion is as follows:

Sometimes,when I close out Firefox,when I go to the terminal window to exit,there will be a string of messages that say "call:12345" Or something like that-there's sometimes a "call",then a colon,and then a 5 digit string of numbers. Each "call" message is on a new line,and there are always five numeric digits after the message.

Can someone tell me what's happening? I've looked through all of my "For Dummies" books,and this isn't addressed. It doesn't seem to be affecting anything,but I'd sure like to know why this happens. My firewall settings are the default RedHat high settings,but I haven't tried fooling with the firewall otherwise.

As always,any help or information is greatly appreciated.

Afraid I cant provide any info on what that is.. but why not just set up a desktop shortcut and not bother worrying about it?
You dont need to mess around with your paths, (although if you installed to /usr/bin it should be in your path), just give the full location when creating the shortcut. Running it by hand from a terminal each time is definatly not the way its meant to be

"System calls" or "software interrupts" are mechanisms used by programs/applications to make requests to the operating system. For more info on them, check out this article on Wikipedia.

Maybe when you're closing, Firefox is trying to make system calls to the computer and, for some reason, can't do it right and it's letting you know (maybe it doesn't unload properly with the "close" call and is forced to use the "kill" call? Or maybe it launched other processes and they were closed before Firefox was and now it's trying to close them?) Or maybe it prints this message when it uses certain system calls and you simply didn't notice this until you closed Firefox.