The following steps provide a basic test of your installation.
DISPLAYenvironment variable is correctly set and that your machine has permission to connect to the display.
CL-USER 1 > (inspect 1)
The inspector is a load-on-demand feature, so if the installation is correct you will see messages reporting that the inspector is being loaded.
CL-USER 2 > (env:start-environment :display <display>)
is the name of the machine running the X server, for example
LispWorks Release Notes and Installation Guide - 23 Dec 2011