Question

what does the 'shield of yellow' refer to ?​

Answer 1

The blue and yellow shield that shows on that icon is the UAC shield that is being placed on a desktop icon if the program requires permission from the user to run for the accounts protection. This is to prevent other users in accessing the program using their account. This cannot be removed by default

Answer 2

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armed in Home and guarding or Away and. guarding. ( the shield will show you which one) Yellow: something needs your attention. Red: the alarm is sounding.