The beginning of a source code depends on the programming language a developer is using.
import java.lang.*
import javax.swing.*
Java, for instance, usually imports java classes by using the IMPORT keyword
#include <stdio.h>
#include <conio.h>
Turbo C/C++ includes library files by using the INCLUDE keyword
<HTML> <HEAD>
Web pages normally start with an HTML container tag.
OPTION EXPLICIT
And Visual Basic could use the OPTION [...]
