Running an ESXi as Virtual Machine inside VMware Worksation or on another ESXi gets more and more useful for testing purposes. That installation, also called "Nested ESXi", is not officially supported by VMware but some VMware developers are willing to help in the VMware communities Nested Virtualization forum. Up to this point is was not possible to install VMware Tools on a nested ESXi, making the management a little bit cumbersome. During VMworld 2013 in Barcelona the news about an upcoming Fling called "VMware Tools for Nested ESXi" came out. The Fling contains a small vib package that can be installed on a virtual ESXi Host.