What will happen if you hold Fn down while resetting PMU?

In reading the steps one has to follow in order to reset the PMU of an iBook g4 (eg: http://support.apple.com/kb/HT1431) you always hit a big warning:

"Do not press the fn (Function) key while using this combination of keystrokes." (which is Shift-Control-Option-Power)

My question is: does anybody know what will happen if you instead press Fn while resetting it? Will it do harm? Has anybody actually tried holding Fn down while resetting the PMU?

Any piece of information will be greatly appreciated as google didn't help this time.

Regards,

m.