Viewing the value of a variable is a common practice when debugging an application.
The Inspect feature of the Visual LISP IDE provides you with the ability to browse, examine, and modify AutoLISP and AutoCAD objects. You can use Inspect to view the following objects:
- Any AutoLISP objects such as lists, numbers, strings, and variables
- AutoCAD drawing entities
- AutoCAD selection sets
Using Inspect, you can also browse through complex data structures.
In the Visual LISP text editor window, it is not possible to inspect a selected expression that is longer than 256 characters. If you select a string longer than 256 characters, you will be prompted to enter an object name. If you specify an object or expression that Visual LISP cannot evaluate, Visual LISP issues a standard AutoLISP error message. Once the error message appears, you can correct the expression and try to evaluate it once more.
Errors arising from evaluation of the object you entered cannot be investigated from a nested break loop because all breaks are disabled during such evaluation. If you wish to examine the error, use the Error Trace tool (click View 
Error Trace from the Visual LISP menu bar), or copy the expression to the Console window prompt and press Enter.