Hello Paul,
There is a way to do this, although it involves editing registry keys which we don't recommend. If you would like to do this to delete a registered computer, go to Start >> Run and type in "regedit" to open the Registry Editor.
Navigate to HKEY_LOCAL_MACHINE >> Software >> National Instruments >> Lookout >> 4.0 >>Machines. You should see the machine names or IP addresses that you registered to use Shared Variables. Delete these machines and they should be removed from your list of Network Items.
Regards,
Clint M
National Instruments
