How can I open multiple tabs with one anchor tag?

This is what I have:

<a target="_blank" href="projects/code1.cpp">Click to view code.</a>

This is what I'm trying to do:

<a target="_blank" href="projects/code1.cpp" href="projects/code2.cpp href="projects/header.h">Click to view code.</a>

Basically, I am just trying to get it to open multiple tabs with a single anchor tag. What's the best way to achieve this?