Codenstuff.com

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        p = New Process
        p.StartInfo.FileName = "application.exe"
        p.StartInfo.UseShellExecute = False
        p.StartInfo.RedirectStandardOutput = True
        p.StartInfo.RedirectStandardError = True
        p.StartInfo.CreateNoWindow = False
        AddHandler p.OutputDataReceived, AddressOf p_OutputDataReceived
        p.Start()
        p.BeginOutputReadLine()
    End Sub

    Public Sub p_OutputDataReceived(ByVal sender As Object, ByVal e As DataReceivedEventArgs)
        UpdateTextBox(e.Data)
    End Sub

    Delegate Sub SetTextCallback([text] As String)
    Private Sub UpdateTextBox(ByVal text As String)
        If Me.TextBox1.InvokeRequired Then
            Dim d As New SetTextCallback(AddressOf UpdateTextBox)
            Me.Invoke(d, New Object() {text})
        Else
            If TextBox1.Text = Nothing Then TextBox1.Text = text Else TextBox1.AppendText(vbNewLine & text)
        End If
    End Sub

In short, your path is:

My Computer ‣ Properties ‣ Advanced ‣ Environment Variables
In this dialog, you can add or modify User and System variables. To change System variables, you need non-restricted access to your machine (i.e. Administrator rights).

Another way of adding variables to your environment is using the set command:

set PYTHONPATH=%PYTHONPATH%;C:\My_python_lib
To make this setting permanent, you could add the corresponding command line to your autoexec.bat. msconfig is a graphical interface to this file.

Viewing environment variables can also be done more straight-forward: The command prompt will expand strings wrapped into percent signs automatically:

echo %PATH%

#!/usr/local/bin/python