David Doria wrote: As a meta-point, can you configure your mailer to use proper threading? Every reply of yours appears as top-level post.

Volodya,

So was my example code way off? Ie. is the short answer that program_options can't take --list a.txt b.txt --list c.txt d.txt and give me 2 vector<string>'s, one containing a.txt b.txt and the other containing c.txt d.txt?

It requires some custom code, no matter what way you try. - Volodya