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diff --git a/windirstat/ModalApiShuttle.h b/windirstat/ModalApiShuttle.h
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+// modalapishuttle.h	- Declaration of CModalApiShuttle
+//
+// WinDirStat - Directory Statistics
+// Copyright (C) 2003 Bernhard Seifert
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+// Author: bseifert@users.sourceforge.net, bseifert@daccord.net
+
+#pragma once
+
+
+//
+// CModalApiShuttle. (Base class for CModalShellApi and CModalSendMail.)
+//
+// Both the SHFileOperation() and MAPISendMail() functions show modeless dialogs,
+// but we want them to be modal.
+//
+// My first approximation was:
+//
+// AfxGetMainWnd()->EnableWindow(false);
+// Do the operation (SHFileOperation respectively MAPISendMail)
+// AfxGetMainWnd()->EnableWindow(true);
+//
+// But when the operation window is destroyed, the system brings
+// some other window to the foreground and WinDirStat ends up in the background.
+// That's because it is still disabled at that moment.
+//
+// So my solution is this:
+// First create an invisible (zero size) (but enabled) modal dialog,
+// then do the operation in its OnInitDialog function
+// and end the dialog.
+//
+class CModalApiShuttle: public CDialog
+{
+	DECLARE_DYNAMIC(CModalApiShuttle)
+
+public:
+	CModalApiShuttle(CWnd* pParent = NULL);
+	virtual ~CModalApiShuttle();
+
+protected:
+	enum { IDD = IDD_MODALAPISHUTTLE };
+	virtual BOOL OnInitDialog();
+	DECLARE_MESSAGE_MAP()
+
+	virtual void DoOperation() =0;
+};