Hi, I am Aurel,(use Autocad Lt 2009) I discovered the filter command and it seems useful to select only some layer... I want to know how to create a button or a keyboard shortcut to prevent write to the command line. I have partially resolved with macro ^ C ^ C_filter to a mouse button. Can I load specific filter in my case called "lancio"? Thank you. (Excuse my English)

There is no commandline version of this command but there are similar methods you can use from scripts and macros. See e.g. the [CMD]SSX[/CMD] command (Express Tools) or (ssget) filters in LISP.