Qckvu can also be queried using the socket commands and will return answers. Typically queries might be: send a list of structures in the file, send a list of layers in the file, send the extents of a given structure, send the library info (i.e. database units and grid)

First we send a request to get_layer_list. Qckvu returns a list of all layer:datatypes that contain data.

Next we request a list of all of the structure definitions in the file. Qckvu returns the comma delimited list.

Then we request the structure root - i.e. the top level structure or structures in the design. In this case, the file has two structure roots: one called TOP and one called 1988.