one process shows different names??

[Information <informations@gmx.at>]

Hi

How can a one PID have different command names?
- isn't that a bug?

ps auxw | grep X
=> root      4139  1.2  0.7 159696 63884 tty7     SNs+  2015 941:49 
/usr/bin/X :0 ....

killall -SIGCONT X    # X: no process found
killall -SIGCONT Xorg    # works!

top | grep 4139 #    => Xorg

thank you
Andrew