Here’s a great tip from Lifehacker about how to set up an AutoHotkey script to copy/paste without manually switching windows:
I have one very simple AutoHotkey script which I use when I need to do some massive copying and pasting work, which simplifies the task into just one keystroke: Win+C.
With this script, I run Notepad (or any program to paste the content into), browse through some web sites, select text or pictures, and hit Win+C to capture the content—without leaving my browser. The script switches to the destination program (Notepad or otherwise), pastes the information, and returns me to my browser automatically. Check out the video for how it works. It’s good for transferring bits of data between two programs like compiling a list of email addresses. It’s also customizable—instead of entering a new line, it can move on to the next cell in the spreadsheet.