Determining Sending Form

I have a form [frmNotes] that is called via different forms in my Windows Application.  Depending on which form calls it, I want the title of frmNotes to change and also I have a few different controls that I want to set as visible depending on the form which called it. For example:

if frmMain calls frmNotes:
    frmNotes.Text = "General Notes"
    button1.Visible = True

if frmSub calls frmNotes:
   frmNotes.Text = "Sub Notes"
   button2.Visible = True

I am not sure how to determine which form has called the frmNotes.

Thanks for the help.