cannot pass commandline args to globale installed node package via bin shortcut

I try to write a commandline app with node and want to install it with npm install -g

After that it is not possible to read out the process.argv array.

I tried this :

// print process.argv
process.argv.forEach(function(val, index, array) {
  console.log(index + ': ' + val);
});

When I call node /bin/myprog parm1 it works.
When I call myprog parm1 no parms are passed.

Any idea to get the parent caller process.argvs? I am Using Windows 7.