Want to be able to open 2 Finder windows side-by-side by clicking an icon on the dock?
To do so:
1. save this applescript to your “~/applications/applescript” folder;
2. open this script with "Applescript Editor.app";
3. modify the “hei”ght and “wid”th to match your monitor;
4. “save as” an application.
5. drag the application (.app) file to your dock next to Finder and give it a new icon.
Here's the script: