system in windows

That is already built in as shell.exec(): please read what we have
provided for you.

All versions of Windows have start *if* shell is using the Windows shell:
but it does not need to.

I misread this the first time, so maybe others did too.  Here's more
detail:

1.  shell.exec() should work in all Win32 versions.  For example,
		shell.exec('http://www.r-project.org')
will open the web page in the default browser (assuming only that the
browser is installed properly).

2.  shell('start http://www.r-project.org') could work in any Win32
version, but the user might have changed the path, or the shell, so it
won't necessarily.

Duncan Murdoch
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