[Basil Abdallah]

السلام عليكم 
الكود قابل للتطوير يوضح الفكرة 
لا تنسو Timer1.Interval = 1
ويندوز 7

كود :

Imports System.Runtime.InteropServices
Public Class Form1
   Dim key As Integer
   Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As System.Windows.Forms.Keys) As Short
   Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
       For i = 1 To 255
           key = 0
           key = GetAsyncKeyState(i)
           If key = -32767 Then
               TextBox1.Text &= Chr(i)
           End If
       Next i
   End Sub
End Class