Gram negative rod-shaped bacteria fall into many categories. Most commonly studied in a microbiology teaching lab are those that fall into the categories of "enterobacteriaceae" and "non-fermenters". Enteriobacteriaceae, or "enteric bacteria" or environmental bacteria that are typically oxidase negative and ferment sugars. Commonly encountered bacteria such as E. coli and Salmonella spp. fall in this category. Non-fermenters, as their name implies, do not ferment sugars. They are often oxidase positive. The most frequently encountered bacteria from this category are the Pseudomonas spp.
VUMIEtm 2012 provides a virtual experience with over 70 enteric bacteria. Non-fermenters are not included in the software. For an overview of how enteric bacteria are identified in the Virtual Lab, and the strategies used to get an ID, work through Micro Digital Media Exercise 8.
Follow your instructor's advice on what needs to be done and whether a lab report is required. When done, you may be asked to take the quiz over this material.