Using the Active Directory command-line tools and information from How do I know what attribute names to use when performing a 'DSQUERY *'?, I have scripted UpdCompDesc.bat to update every computer in Active Directory that has a blank (nul) description with the description that is set on the local computer.

UpdCompDesc.bat contains:

                              @echo off                              setlocal                              set q1=dsquery * domainroot -filter "(&(objectCategory=Computer)(objectClass=Computer))"                              set q2=-attr name distinguishedName -Limit 0                              for /f "Skip=1 Tokens=1*" %%a in ('%q1% %q2%') do (                               set name=%%a                               set dn="%%b"                               call :attr                              )                              endlocal                              goto :EOF                              :attr                              set dn=%dn:  =%                              set dn=%dn: "="%                              set desc=""                              for /f "Skip=1 Tokens=*" %%c in ('dsget computer %dn% -desc^|find /i /v "dsget succeeded"') do (                                if "%%c" NEQ "" set desc="%%c"                              )                              if %desc% NEQ "" goto :EOF                              set dok=1                              set desc=""                              for /f "Skip=1 Tokens=*" %%v in ('net view \\%name%') do (                               set work=%%v                               call :view                              )                              if "%dok%" NEQ "3" goto :EOF                              call :upd                              goto :EOF                              :view                              if "%dok%" EQU "3" goto :EOF                              if "%dok%" EQU "1" set desc="%work%"&set dok=2&goto :EOF                              if "%dok%" NEQ "2" goto :EOF                              if "%work:~0,11%" NEQ "Share name " goto :EOF                              set dok=3                              goto :EOF                              :upd                              set desc=%desc:  =%                              set desc=%desc: "="%                              @echo dsmod computer %dn% -desc %desc%                              dsmod computer %dn% -desc %desc%