Can't open any windows when i'm in root (su)

hi...
when i'm in my account then i need to open a window in su appears this message error:
# konqueror .
No protocol specified
konqueror: cannot connect to X server :0.0
anyone can help me with this?

i want to logging as a user and then became root with su and open a window...
but i don't want do do kdesu konqueror (use konqueror like an example)...
i want to be able to open a window in root account in an time...
i try the command
xhost +
but i read that is no very good for security...
what i've to do?

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