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Shearwalls calculates and displays both leeward (suction) and windward loads. Except for certain surfaces in the NBC method, the leeward criterion is greater than the windward one for tributary widths < 10 feet. For all situations other than these cases, the suction C&C loads govern for both nail withdrawal design and plywood bending strength. In these cases, it is the positive internal pressures that are considered for C&C loads.
For the case that the windward load case is greater, the program finds the worst case combination of windward exterior / negative internal, and leeward exterior / positive internal coefficients, and uses these to generate loads for sheathing bending design. For nail withdrawal design, the leeward loads are used.