Magnetospheric issues are discussed as they relate to radio intensity variations, spindown, rotational noise, and emission altitudes. Radio fluctuations trace the overall state(s) of the magnetosphere in spite of the fact that Lradio ≪ IΩ. Five methods for estimating emission altitudes re are discussed. Four measure either the transverse width or radial depth of the emission region; assumption of a dipolar field and, in some cases, a radius to frequency mapping, yields estimates for the absolute radius of the emission region. The fifth method (v/c effects in Stokes parameter waveforms) provides direct altitude estimates. Most results suggest that re ≲ 0.02 RLC at v = 0.4 GHz. A radius to frequency mapping appears viable for some but not necessarily all objects. The mapping need not be one-to-one. Prospects are discussed for using simultaneous radio and high energy observations to make further progress in our understanding of magnetospheres.