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给你个参考的例子，窗体打开时可能大小有变化，软件名可能有变化
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先加个控件ListBox1，运行后双击ListBox1上程序名
Public Class Form1
Public myProcess() As Process
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim myProcesses() As Process = Process.GetProcesses()
Dim jh As New ArrayList
For Each bs As Process In myProcesses
If CInt(bs.MainWindowHandle) 0 Then
ListBox1.Items.Add(bs.ProcessName)
jh.Add(bs)
End If
Next
ReDim myProcess(jh.Count - 1)
jh.CopyTo(myProcess)
End Sub
Declare Function ShowWindow Lib "user32" Alias "ShowWindow" (ByVal hwnd As Integer, ByVal nCmdShow As Long) As Integer
Private Sub ListBox1_MouseDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles ListBox1.MouseDoubleClick
Dim a As Process = myProcess(ListBox1.SelectedIndex)
Try
Dim dd = ShowWindow(a.MainWindowHandle, H1)
AppActivate(a.Id)
Catch ex As Exception
End Try
End Sub
End Class
这样不好，应该使用 Table 键，按照 Table 键顺序来切换。因为回车往往用来确定你要按下页面的确定按钮。如果非要使用回车：
Private Sub 文本框按下回车键(sender As Object, e As KeyEventArgs) Handles TextBox3.KeyDown, TextBox2.KeyDown, TextBox1.KeyDown
If e.KeyCode = Keys.Enter Then
Select Case sender.name
Case "TextBox1"
TextBox2.Focus()
Case "TextBox2"
TextBox3.Focus()
Case "TextBox3"
TextBox1.Focus()
End Select
End If
End Sub
Public RunProcess As Process
RunProcess.start("djiwqjidjwqi")
AppActivate(RunProcess.Id())