Can I have 2 pop-up windows open at the same time?

Can I have 2 pop-up windows open at the same time?

I have a report, and I have a custom action that opens up another list, in a pop-up window.

While that pop-up is open, can I use a 2nd custom action to open a form in another pop-up window?

The only work-around I've come up with is to open a 2nd tab in the browser....