Chrono boost without switching screens

How do you cast chrono boost on a gateway/stargate without looking back at the base
eg. while you’re microing units on the frontline

Thanks in advance

Press your nexus hotkey, press chrono hotkey, then press the whatever structure you have hotkey then click on that structure in the unit tab.

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Or you can have screen hotkeys to switch back in forth between where your buildings are.

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Via minimap. Select your nexuses and then just click chronoes at the squares on minimap, it works easiest when boosting other nexuses