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A solid theoretical understanding of how inflowing, accreting plasma aroundblack holes and other compact objects gives rise to outflowing winds and jetsis still lacking, despite decades of observations. The fact that similarprocesses and morphologies are observed in both X-ray binaries as well asactive galactic nuclei has led to suggestions that the underlying physics couldscale with black hole mass, which could provide a new handle on the problem. Inthe last decade, simultaneous broadband campaigns of the fast-varying X-raybinaries particularly in their microquasar state have driven the developmentof, and in some cases altered, our ideas about the inflow/outflow connection inaccreting black holes. Specifically the discovery of correlations between theradio, infrared and X-ray bands has revealed a remarkable connectivity betweenthe various emission regions, and argued for a more holistic approach totackling questions about accretion. This article reviews the recent majorobservational and theoretical advances that focus specifically on the relationbetween the two "sides" of the accretion process in black holes, with anemphasis on how new tools can be derived for comparisons across the mass scale.

From Multiwavelength to Mass Scaling: Accretion and Ejection in Microquasars and AGN