handle-args-function-alist

handle-args-function-alist is a variable defined in `startup.el'.
Its value is

((x . x-handle-args) (nil . tty-handle-args))

Documentation:
Method for processing window-system dependent command-line arguments.
Window system startup files should add their own function to this
method, which should parse the command line arguments. Those
pertaining to the window system should be processed and removed
from the returned command line.