MS Power Point
You can tell when an object is active because

The object is highlighted
Eight small sizing handles appear surrounding the text
b and c
A box frame appears surrounding the text

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MS Power Point
How to create additional Guide Lines?

by holding Ctrl key, click on existing Guide Line and drag
Additional Guide Lines cannot be created
by holding Ctrl + Alt key, click on existing Guide Line and drag
by holding Alt key, click on existing Guide Line and drag

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