What programmer-specific function can the old Esc do?

I've recently re-remapped my tilde/backtick to Escape 开发者_开发知识库(that's how at least I originally learned) and put the tilde/backtick in the left-Windows key (again how I originally learned).

That floating Esc key way up in the NorthWest now, I've thought about mapping it a copy of F9 (for a generic SQL execution key). Is there a suggested use for the floating Escape key that can assist a programmer?

Several ideas:

• to compile
• to execute an app
• as an escape character (ie a ^C to kill a Linux/Dos app)
• as another break key (like the one North East on your keyboard, to use your terms)
• to switch to documentation and back
• to clear cache (if web dev)
• a variety of other cleanup ideas - cache, cookies, temp files, data files, logs...

1. To launch an often used app (like your browser)
2. To launch a launcher (like Launchy)
3. To lock your computer
4. To bring up a new email form
5. To take a screenshot
6. To show the desktop, maximize/minimize current window, etc.
7. To play/pause music
8. 2 words: "Boss key"

How about mapping it to go to Stack Overflow?