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Large, useful manual available from Help menu
Boolean and derived layer operations; subtract, grow and shrink on groups of objects
Design navigator for easy traversal of design hierarchy
Area calculator (in Tools -> Add-Ins)
Cross-section viewer to simulate a set of simplified process steps and visualize vertical structure of a device
Support for parameterized cells called T-Cells
User-programmable interface (UPI) with C/C++ syntax
Documentation:
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