  We calculate the spin-spin and current-current correlation functions in
states exhibiting d_{{x^2}-{y^2}}-density wave (DDW) order, d_{{x^2}-{y^2}}
superconducting order (DSC), or both types of order. The spin-spin correlation
functions in a state with both DDW and DSC order and in a state with DDW order
alone, respectively, illuminate the resonant peak seen in the superconducting
state of the underdoped cuprates and the corresponding feature seen in the
pseudogap regime. The current-current correlation function in a state with both
DDW and DSC order evinces a superfluid density with doping dependence which is
consistent with that of the underdoped cuprates. These calculations strengthen
the identification of the pseudogap with DDW order and of the underdoped
cuprates with a state with both DDW and DSC order.
