How Can I Send Orders To Another Program By Using Vb.Net

Imports System.Threading
Public Class Form1
    Dim a As New Process

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        a.StartInfo.FileName = "C:\Program Files\AVG\AVG2015\avgui"
        Me.MinimizeBox = True
        a.Start()
        Thread.Sleep(5000)
        SendKeys.SendWait("{TAB}")
        Thread.Sleep(200)
        SendKeys.SendWait("{TAB}")
        Thread.Sleep(200)
        SendKeys.SendWait("{TAB}")
        Thread.Sleep(200)
        SendKeys.SendWait("{TAB}")
        Thread.Sleep(200)
        SendKeys.SendWait("{TAB}")
        Thread.Sleep(200)
        SendKeys.SendWait("{ENTER}")
    End Sub