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First screen
The first screen you see after loading is contains commonly needed file controls (new, load, exit, etc.). It also shows a list of recently edited PCBs, along with a preview image, so you can load up your last project with a single click. On the right is a web page containing help.

Editing a PCB
You can see a few tracks and vias placed on the PCB. Notice that none of the tracks are straight, but they all correctly avoid the vias.

Also notice that there are no banks of icons crowding the screen.

The Hex Menu
Holding the right mouse button brings up the menu.

The Hex Menu 2
Move the mouse to any of the icons and, more icons appear along a similar theme. In this example, the mouse is over the wiggly red track icon, and the menu has expanded to show the via, component and component library icons. Release the button to select that icon.

3D Capabilities
The shape of the PCB can easily be defined by importing a polygon mesh created in a CAD package. LiquidPCB automatically recognises the outline. It also recognises any holes, and places fixed vias over them.

Inputs and Outputs
LiquidPCB is aware of the flow of information into and out of your PCB project. For example, a typical PCB will use a netlist, generated from a schematic capture package. It may also use a 3D model file from a CAD package. These are the inputs Rather than simply importing these files into LiquidPCB, you create a dependency on them. So, if any of those files are modified, LiquidPCB will automaically inform you, and give you the option to update.
Likewise, Output files generated from the PCB (Gerber, engineering drawings, BOMs, etc.) will be automatically updated when the PCB changes.

Closer look at some Inputs
Here you can see the two inputs for this project, a 3D model of the board, and a netlist.