Function Cr$(P1)

This function returns the the two bytes (ASCII 13 and ASCII 10) which are used to denote the end of a line in text documents.

This script pastes...

This is line one
This is line two

Text1 = "This is line one" + Cr$() + "This is line two"
Paste Text1

ASCII = American Standard Code for Information Interchange.
Search ASCII Tables for details.