The !envvar extension displays the value of the specified environment variable.
Specifies the environment variable whose value is displayed. Variable is not case sensitive.
Windows XP and later
For more information about environment variables, see Environment Variables and the Microsoft Windows SDK documentation.
The !envvar extension works both in user mode and in kernel mode. However, in kernel mode, when you set the idle thread as the current process, the pointer to the Process Environment Block (PEB) is NULL, so it fails. In kernel mode, the !envvar extension displays the environment variables on the target computer, as the following example shows.
0:000> !envvar _nt_symbol_path _nt_symbol_path = srv*C:\mysyms*https://msdl.microsoft.com/download/symbols