GetComponent question

Hi,

In the following code from the script reference pages here I'm confused over where OtherScript is coming from. Can someone explain please?

Thanks.

Code (csharp):

1.  
2. function Start () {
3. // By name
4. var go = GameObject.Find("SomeGuy");
5. go.GetComponent(OtherScript).DoSomething();
6.  
7. // By tag
8. var player = GameObject.FindWithTag("Player");
9. player.GetComponent(OtherScript).DoSomething();
10. }
11.