Keyboard Shortcuts and optimized data entry

During direct data entry in Specify 6, our technicians have come to rely very effectively on the use of the 'Tab' key to move to various fields on the Collection Object form. This allows them to keep their hands and fingers on the keyboard through most of the data entry process. However, when the 'Tab' navigates to a 'Green Plus Sign' (i.e. to open a subform) they must remove at least one hand to grab a mouse and 'Click'. Does anyone know of a key on the keyboard that can affect the same desired result. Could this be a programming issue? Say modifying code to activate 'Green Plus Sign' both "on click" and "on enter".
Thanks,
Herrick

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Space Bar will open subform

Thanks Theresa!

Answer:

It's spacebar for anyone else who wants to know.