More Sub panel questions

The sub panel that is right next to the 200 amp main service panel. The sub is fed from a 100 amp breaker in the main. The main breaker and the 100 amp breaker in the main panel are easily reached without takeing a step away from the sub. Since the panels are right next to each other, does the sub need its own main breaker? Can I use #3 AWG for the 100 Amp supply to the sub?
Previous owner added this sub panel to be used for his generator, inverter set up. The panel was wired only to one side of the line because his 120 V inverter.
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Since the panels are right next to each other, does the sub

NO Usefull site, http://homewiringandmore.com/homewiringusa/2002/maindwelling/meter/meter.htm l

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Yes, because it protects the wires used to connect the sub-panel.

You have to run wire that is rated for the full main amps, if you wanted to get rid of the breaker that feeds the sub-panel. That is how multiple boxes (in big houses) are wired up, so that they all shut off a single main.
If you run smaller wire, then you have to go with the feed breaker like you have now.
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The 100 amp breaker feeding the sub in the main, would act as a main for the sub. The subpanel it self does not need to have a main breaker installed.
Thanks, Tony D.
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