Hi everyone,I'm looking for the System variables, or similar, to be able to search a layer by typing the first letter name in the layer drop down.I know it can be able because in another computer I can do that . I'm working on pc (win8) on autocad2011.Thank you for all your help!      

You want to search for a layer via the command line?Look in the lower left hand corner of your screen.  There should be a symbol that looks like an open end box wrench.  Click on it.  On the flyout menu select Input Settings.  Now make sure that Search Content is enabled.
John Connor2018-03-22 13:37:10

Thanks mate, but unfortunately I do not have a wrench (my version must be earlier) I've tried DSETTINGS command and OPTIONS menu, but I didn't find.

The variable is INPUTSEARCHOPTIONS.  I'm not sure when this feature was first introduced.  If it doesn't work in your version then you are out of luck.