#include "windows.h"
#include <iostream.h>
int main(int argc, char* argv[])
{
?HANDLE hMutex=CreateMutex(NULL,TRUE,"test");
?if (hMutex)
?{
??if (ERROR_ALREADY_EXISTS==GetLastError())
??{
???MessageBox(NULL,"already running","",MB_OK);
???return 0;
??}
?}
?while (1)
?{
?}
?
?return 0;
}