[R] Can I set the proxy server and authentification from within R?

[Werner Wernersen]

Hi,

I am using Tinn-R and somehow I cannot point it to
start a R shortcut with http_proxy settings including
authentification. It always shows the .exe.

Is there any way to set the proxy from within R or any
other ideas how to do it?

I am using R 2.4 for Windows.

Thanks a million,
  Werner