Reading the registry from a .bat file

I've searched a bit on web before asking and I apologies a head of time but my knowledge of .bat files is a little lacking. Currently I have a working .bat file I created, but was looking to adding something extra to it and just can't seem to find exactly
what I need.. What i'm looking to do is at the top of .bat file I want it to read the registry here HKEY_LOCAL_MACHINE\SOFTWARE\IS_DEPT\Simage\HW\Platform
Under Platform we either have 2 types LT or DT. (laptop or desktop)
What I want to do is at the top of my bat file have it search this key. If it has the value LT I want it to continue on with the script. If the value is DT I want it to not run the rest of the script and go to :end
If this is possible can someone provide me with the commands to put at the top of the script with also the IF commands to continue or go to :end

Thanks for you reply but I'm still a little lost with the reply.
What is the rest of the commands?
I understand this will query the registry, but what about searching for "LT or DT" and the IF/GOTO Commands?
reg query HKEY_LOCAL_MACHINE\SOFTWARE\IS_DEPT\Simage\HW\Platform
I think my confusion is how to define LT or DT as the variable. I keep finding %errorlevel% variable, but that seems to only define on (1) or off (0)
Here's what I have so far and I dont' think it's correct.
reg query HKEY_LOCAL_MACHINE\SOFTWARE\IS_DEPT\Simage\HW\Platform /f
if "%ERRORLEVEL%" == "LT" GOTO HOME
if "%ERRORLEVEL%" == "DT" GOTO NOOOOPE

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Thanks for you reply but I'm still a little lost with the reply.
What is the rest of the commands?
I understand this will query the registry, but what about searching for "LT or DT" and the IF/GOTO Commands?
reg query HKEY_LOCAL_MACHINE\SOFTWARE\IS_DEPT\Simage\HW\Platform
I think my confusion is how to define LT or DT as the variable. I keep finding %errorlevel% variable, but that seems to only define on (1) or off (0)
Here's what I have so far and I dont' think it's correct.
reg query HKEY_LOCAL_MACHINE\SOFTWARE\IS_DEPT\Simage\HW\Platform /f
if "%ERRORLEVEL%" == "LT" GOTO HOME
if "%ERRORLEVEL%" == "DT" GOTO NOOOOPE

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