A new native URL function a=edr?

I just noticed there is a new URL function called "a=edr" which behaves just like the regular edit record action. It only directs me to this action through Homepage's Calendar widget with links set to edit records. What is the purpose of this action and how is it different from regular er?

A little background info borrowed from Dan:
Those actions like "a=dr" (display record), "a=er" (edit record) and "a=nwr" (new record) are "native" actions meaning that they appear in the Address Bar and represent the primary actions of the normal GUI interface.