How to make text simultaneously appear in messages

I was wondering how I would do this, I'm not entirely sure how to ask this question and I didn't bother to look on the forums seeing as that this could be put in a multitude of ways.

Basically I want my text when printed to appear as for example the sentence "Hello World."

H
e
l
l
o
W
o
r
l
d

But all in one line.

How would I begin?

Sorry I'f this is in tut's D:

Something like this maybe?

textutils.slowPrint("Hello World.")