n = SendDlgItemMessage(hwnd, IDC_SESSLIST, LB_GETCOUNT, 0, 0);
for (i = n; i-- > 0;)
SendDlgItemMessage(hwnd, IDC_SESSLIST, LB_DELETESTRING, i, 0);
n = SendDlgItemMessage(hwnd, IDC_SESSLIST, LB_GETCOUNT, 0, 0);
for (i = n; i-- > 0;)
SendDlgItemMessage(hwnd, IDC_SESSLIST, LB_DELETESTRING, i, 0);