General Question Regarding User Controls

[Ahara]

Hello Gurus;

I am in the midst of learning vb's User Control capabilities (just created my own Calendar control) and I think I am missing something. The following is a snippet of code from a tutorial:

[vbcode]
'WARNING! DO NOT REMOVE OR MODIFY THE FOLLOWING COMMENTED LINES!
'MappingInfo=tmrTicker,tmrTicker,-1,Interval
Public Property Get Interval() As Long
Interval = tmrTicker.Interval
End Property

[/vbcode]

My question is about the commented line that has MappingInfo=etc...What does this line do? As the comment indicates it above, it would seem that it executes. I have been looking for a simple explanation for this, but even the tutorial I grabbed the example from does little to shed ample light. Thanks much.