#include "stdafx.h"
...
const HOTKEY = 'T';  // <WinKey>+T is hotkey to activate
static void SendString(LPCTSTR str);

class CStaticAbbrev : public CStatic {
protected:
   afx_msg UINT OnGetDlgCode() {
      return DLGC_WANTCHARS; // I want all chars
   }
   afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);
   DECLARE_MESSAGE_MAP()
};

class CMyDialog : public CDialog {
public:
   CMyDialog(CWnd* pParent = NULL);
   ~CMyDialog();
protected:
   ...
   CStatic m_wndHelp;      // help message
   CButton m_wndOK;        // OK/Exit button
   CStaticAbbrev m_wndKeys;// static text to display/receive abbreviations

   UINT m_nIDHotKey;       // hot key identifier
   BOOL m_bFirstTime;      // first time activated?

   afx_msg LRESULT OnHotKey(WPARAM wp, LPARAM lp);
   DECLARE_MESSAGE_MAP()
};

struct ABBREV {
   TCHAR key;
   LPCTSTR text;
} MYABBREVS[] = {
   { _T('n'),_T("Elmer Fudd") },        // name
   { _T('a'),_T("1 Bunny Way") },       // addr
   { _T('c'),_T("Redmond") },           // city
   { _T('p'),_T("206 555 1212") },      // phone
   { 0,NULL},
};

BEGIN_MESSAGE_MAP(CStaticAbbrev, CStatic)
   ON_WM_GETDLGCODE()
   ON_WM_CHAR()
END_MESSAGE_MAP()

void CStaticAbbrev::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) {
   for (int i=0; MYABBREVS[i].key; i++) {
      if (nChar==MYABBREVS[i].key) {         // found:
         GetParent()->ShowWindow(SW_HIDE);   // ..hide dialog
         SendString(MYABBREVS[i].text);      // ..and send text
         return;
      }
   }
   MessageBeep(0);
}

LRESULT CMyDialog::OnHotKey(WPARAM wp, LPARAM lp) {
   if (wp==m_nIDHotKey && !IsWindowVisible()) {
      if (m_bFirstTime) {
         // first activation: replace initial message with abbrevs list
         CString text;
         for (int i=0; MYABBREVS[i].key; i++) {
            CString temp;
            temp.Format(_T("%c = %s\n"), MYABBREVS[i].key,
               MYABBREVS[i].text);
            text += temp;
         }
         m_wndKeys.SetWindowText(text);
         m_wndHelp.SetWindowText(
            _T("Type one of the keys below to enter text."));
         m_wndOK.SetWindowText(_T("E&xit"));

         m_bFirstTime = FALSE;
      }
      ShowWindow(SW_NORMAL);  // activate myself
      m_wndKeys.SetFocus();   // set focus to abbrev control
   }
   return 0;
}

static void SendString(LPCTSTR str) {
   INPUT inp[2];
   memset(inp,0,sizeof(INPUT));
   inp[0].type = INPUT_KEYBOARD;
   inp[0].ki.dwFlags = KEYEVENTF_UNICODE; // to avoid shift, and so on
   inp[1] = inp[0];
   inp[1].ki.dwFlags |= KEYEVENTF_KEYUP;

   for (LPCTSTR p=str; *p; p++) {
      inp[0].ki.wScan = inp[1].ki.wScan = *p;
      SendInput(2, inp, sizeof(INPUT));
   }
}

Figure 4 ExitWindowsEx Flags