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Since you say you want to see it ALL, I am assuming you want more than just trouble-codes for each module. The Vetronix Tech-1A and MasterTech scan-tools allow you to send commands, as well as, read data. As an example, if you have the chassis cartridge for the ABS/ASR system, you can send a command to each individual wheel to make the ABS on that wheel active -- with the car in the air, an assistant should be able to turn that wheel by hand even though you have your foot firmly planted on the brake pedal. Then, you know the ABS to that wheel is working. You can also view the individual wheel speed for each wheel speed sensor. When going down a straight road, each wheel should read the same speed as the speedometer.
That is just an example of the capabilities of the Vetronix scan-tools.