•Virtual Bus is a single signal defined as multiple bits. This is the most common and easiest to work with because all of the normal signal editing techniques work on it.

•Group Bus displays the aggregate values of its member signals. This is handy way to manage lots of single bit signals that have been imported from other sources.

•Simulated Bus is a simulated signal defined as a concatenation of it member signals. This is primarily designed for the testbench products so that both a member signal and the whole bus can be passed to models as needed.

•Differential Signals are two-bit group buses that display a superimposed image of the member signal waveforms.