You have certain level of control over the initial state of a digital circuit. The input pins of digital devices are always initialized to the Initial Unknown strength & level. You can set the initial state of the output pin of some digital devices such as latches and flip flops. This is done using the "IC" parameter of these devices, which usually has a default zero value.
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==Power Dissipation==
The output change count of a CMOS component is incremented by one each time an output pin changes its logic value (level or strength). The input change count is incremented by one each time one or more input pins change values. This is a rough approximation, since it doesn't take into account factors such as the voltage levels at the inputs, or the temperature, or the fact that for devices with multiple outputs, different pins have different loads, and these pins may change in concert, or one at a time.
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==Digital Clocks==