Info needed on gtk_window_begin_move_drag()

["Santhana Krishnan" <santhana krishnan wipro com>]

Hi,
  Could anyone please tell me in which context  the following calls will be
used?.Also if u have any examples please do send me.

gtk_window_begin_move_drag ()
gtk_window_begin_resize_drag ()

thanks in advance,
Santhana