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You can hide a button in page A, and set it to be a trigger of the updatepanel, then you can access to the button by using "window.parent.document.getElementById('Button1')" in page B.
Try the following codes,it works great:
Page A
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = DateTime.Now.ToString();
}
</script><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<div style="visibility:hidden"><asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" UseSubmitBehavior="false" /></div>
</ContentTemplate>
</asp:UpdatePanel>
<iframe src="Default13.aspx" mce_src="Default13.aspx"></iframe>
</div>
</form>
</body>
</html>Page B
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="button" onclick="javascript:window.parent.document.getElementById('Button1').click();" name="Button1" value="Button" id="Button1" /></div>
</form>
</body>
</html>