Visual LISP, AutoLISP and General Customization

[#1]

I need to erase a variable seted to the environment with SETENV, but not seting it to a value like "".

I need that when it is reading with GETENV, return a NIL value like when it wasn't exist after the first seting

Thanks in advance

[#2]

Hi

For example

(defun delenv(env / cle)
  (setq cle (strcat "HKEY_CURRENT_USER\\" (vlax-product-key) "\\FixedProfile\\General"))
  (if (vl-registry-read cle env)
    (vl-registry-delete cle env)
  )
)

 
@+

[#3]

If not mistaken, SETENV and GETENV accesses the registry keys established by the software.

By deleting these keys you are asking for trouble.

If you established keys using VL-REGISTRY-WRITE, and you SETVAR/SETENV using your

VL-REGISTRY-READ, deleting these keys will only corrupt your program, and not the software.

Be careful.

???