Multi threading with a QUAD CORE CPU

Hi,

I am using simple threading to spawn Html parsing algorithiums from a class file, my question is, will a new thread automatically be assigned to an unused core in a quad core system? if I spawn 4 threads within say 500ms, and each has an execution time of 1000ms, will the oporating system manage the cpu assignment in the best way, or is there something else I should be doing?

Below is my threading code simplified:

Imports System.Threading
Module HtmlParcer
 
    Sub ParseSite1(ByVal sHtml As String)
        Dim oThread As New ParseThreadClass
        oThread.sHtml = sHtml
        Dim t As New Thread(AddressOf oThread.ParseThread1)
        t.Start()
 
    End Sub
 
    Public Class ParseThreadClass
        Public sHtml As String
        Public Sub ParseThread1()
 
'### DO SOMETHING
        End Sub
    End Class
End Module

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