The plasma membrane defines the outer limit of eukaryotic cells and it is here that cells interact with their environment through receptor proteins. Clearly the management of cell surface receptor concentration is critical for normal cellular function, and this is achieved through two key processes, exocytosis and endocytosis. During exocytosis transport vesicles containing both membrane receptors and soluble cargo fuse with the plasma membrane releasing cargo and delivering receptors to the cell surface. During clathrin mediated endocytosis receptors destined for internalisation become concentrated in clathrin coated pits before coat invagination and membrane fission. Since transferrin receptors are recycled and undergo numerous rounds of exocytosis and endocytosis by labeling transferrin receptor with an appropriate fluorophore it is possible to label both exocytic and endocytic organelles in the same cell. We have exploited this phenomenon to visualise the spatial and temporal organisation of constitutive exocytosis and endocytosis at the surface of single cells using dual wavelength evanescent field microscopy.