关于vb.net：在这个程序中使用的是什么？

What is the use of := in this program?

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Possible Duplicate:
VB.NET := Operator

昨天我在浏览微软？代理代码片段，我看到：=在调用函数时使用。

我试着在谷歌上搜索它，但找不到任何相关的信息。

是否使用：=因为我们正在调用COM库的函数？

代码：

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Public Class Form1

Dim agent As AgentObjects.Agent
Dim merlin As AgentObjects.IAgentCtlCharacter

Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
agent.Characters.Unload("merlin")
merlin = Nothing
agent = Nothing
End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
agent = New AgentObjects.Agent
agent.Connected = True
agent.Characters.Load(CharacterID:="Merlin", LoadKey:="merlin.acs")
merlin = agent.Characters(CharacterID:="Merlin")
agent.PropertySheet.Visible = True
End Sub

Public Sub IntroMerlin()
Dim strName As String
With merlin
'Display character.
.Show()
'Make the character play an animation.
.Play(Animation:="Greet")
.Play(Animation:="Restpose")
.Speak(Text:="Hello!")
.Play(Animation:="Announce")
.Speak(Text:="I am Merlin.")
.Play(Animation:="Pleased")
.Speak(Text:="It is nice to meet you.")
End With
End Sub
End Class

谢谢。