[HaBo]

#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

int main()
{
 HANDLE hComm;
 
hComm = CreateFile( \"Com1\",  
                    GENERIC_READ | GENERIC_WRITE, 
                    0, 
                    0, 
                    OPEN_EXISTING,
                    FILE_FLAG_OVERLAPPED,
                    0);
 if (hComm == INVALID_HANDLE_VALUE)
 printf(\"Fehler\");
 return (0);
}