`Spectral flow as a map between N=(2,0)-models' Abstract: The space of (2,0) models is of particular interest among all heterotic-string models because it includes the models with the minimal SO(10) unification structure. The fermionic Z_2xZ_2 heterotic-string models revealed the existence of a new symmetry in the space of string configurations under the exchange of spinors and vectors of the SO(10) GUT group, dubbed spinor-vector duality. Such symmetries are important for the understanding of the landscape of string vacua and ultimately for the possible operation of a dynamical vacuum selection mechanism in string theory. We will discuss how to generalize this idea to arbitrary internal Conformal Field Theories (CFTs). We will also see how the spectral flow operator normally acting within a general $(2,2)$ theory can be used as a map between (2,0) models.