The primary use for tabs in HyperMesh is to house browsers. You may still encounter other tabs, such as file import/export tabs, while using HyperMesh--but these are common features that appear in multiple HyperWorks Desktop applications, and are not specific to HyperMesh itself. In addition you may encounter other browsers in the tab area as well when using other applications, but this section of the HyperMesh Help refers specifically to the features that only display when HyperMesh is the active desktop application.
HyperMesh tabs include the following:
HyperMesh Entity State Browser