1- How to quickly mirror an object?-> Hold down Ctrl and drag a selection handle to the opposite side of the object.
2- How to select an hidden object difficult to select?-> Press Tab until a selection box appears around the object...
3- What is the fastest way to select all objects in your work space? -> Just double click the Pick tool!
Tips provided by Roger Wambolt, CorelDRAW team.
When you want to select an object that is behind another, you can also hold down the Alt button while selecting.