# Shared Features in Vehicle Spy

The following features are used by many different areas in Vehicle Spy:

* [Calculated Signal Editor](/vspy-3-documentation/shared-features-in-vehicle-spy/shared-features-calculated-signal-editor.md) - creates calculated values for Application Signals or Tx Panel signals.
* [DTC Database](/vspy-3-documentation/shared-features-in-vehicle-spy/shared-features-dtc-database.md) - defines diagnostic trouble codes.
* [Expression Builder](/vspy-3-documentation/shared-features-in-vehicle-spy/shared-features-expression-builder.md) - builds many different types of expressions used across Vehicle Spy.
* [Predefined Function Keys](/vspy-3-documentation/shared-features-in-vehicle-spy/shared-features-predefined-function-keys.md) - keyboard function keys F1-F5 preassigned to Vehicle Spy tasks.
* [Starting with a Selected View](/vspy-3-documentation/shared-features-in-vehicle-spy/shared-features-starting-with-a-selected-view.md) - controls which screen Vehicle Spy starts with.
* [Widgets](/vspy-3-documentation/shared-features-in-vehicle-spy/shared-features-widgets.md) - programmable buttons along the window edges that can do various tasks.


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