Than you bigstar (
postt #3) for your comments and solution.
While on the topic of the correctness of the help file, I would guess that the description for the 
/S switch is incorrect.
Part of the current 
/S switch description is:
	Code:
	Perform a completely silent unintended operation
   I would imagine that "unintended" should have been "unattended"; it would certainly never be desirable for for installation to be unintended.