If you need to change or create custom data on someone's PC, the recommended procedure is to remote control their machine and start the CDF from there. If that doesn't work for you, there is another way but its in no way supported.

Requirements:

• Must be able to map to remote system via Microsoft Share
  
• Must install Console Extender from Managed Planet(it's free).

1. Create a new Item in the Console Extender, as shown below
   
   
2. Here is the LD-CustomData.CMD files content as shown in image above. Please insert your username and password used for mapping to the remote system where it says <PASSWORD> and <USERNAME>
   

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@echo off
if exist \\%1\c$ goto EXPR
echo Connecting to Remote System "%1"
net use \\%1\c$ <PASSWORD> /user:%1\<USERNAME>
if not exist \\%1\c$ goto SUBEND
:EXPR
"\\%1\c$\program files\landesk\ldclient\LDCSTM32.EXE"
net use \\%1\c$ /delete
goto END
:SUBEND
echo There is a problem connecting to the remote system...
pause
:END
exit
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You're done with setting it up.

When you right click on a device and select "Custom Data Form" and it will remotely execute the custom data form and you an update it. Just make sure you right click and run an inventory after your done editing the custom data form so you can see the changes in the console.