Exact semianalytic solutions for GRB outflows were recently derived using the equations of special-relativistic ideal MHD (see the contribution by Vlahakis & K?nigl for a summary). This contribution focuses on the implications of these results to various modeling and observational issues in GRB sources, including the baryon loading problem, polarization measurements of the prompt and reverse-shock emission, and the possible existence of a two-component outflow.
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