<p>So I was reading these Asp.Net <a href="http://www.hanselman.com/blog/ASPNETInterviewQuestions.aspx" rel="nofollow noreferrer">interview questions</a> at Scott Hanselman's blog and I came across this question. Can anyone shed some light of what he's talking about.</p>

I think what he's asking here is how you wire up javascript functions to work hand in hand with your ASP.NET postback functionality.
i.e. How can I trigger a control's event using my own JavaScript?
The ASP.NET class library contains a
```
ClientScript
```
class - Found in the
```
System.Web.UI.Page
```
class - which enables you to programmatically add JavaScript to your ASP.NET page.
This contains a method called
```
GetPostBackEventReference
```
which will generate the
```
__doPostBack
```
script ASP.NET utilises to trigger events wired up to your web controls.
Hope that makes sense