super
Essentially, it allows you to use the implementations of the current class' superclass.
For the gritty details of the Objective-C runtime:
[super message] has the following meaning:
When it encounters a method call, the
compiler generates a call to one of
the functions objc_msgSend,
objc_msgSend_stret, objc_msgSendSuper,
or objc_msgSendSuper_stret. Messages
sent to an object’s superclass (using
the super keyword) are sent using
objc_msgSendSuper; other messages are
sent using objc_msgSend. Methods that
have data structures as return values
are sent using objc_msgSendSuper_stret
and objc_msgSend_stret.
So yes, it is static, and not determined at runtime.
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