Task System - Environment - List Variables
System - Environment - List variables lists all variables for a process, user or local machine.

Credentials
To control a remote computer you may need to use a Credential. The Credential must match the user name and password of the user that you want to login for. Select a Credential in the combo box or click the Settings icon to open Manage credentials in order to add or edit Credentials.
Environment variable settings:
Variable scope
Select Process, User or Machine variable scope. These variable scopes refers, more or less, to Windows 10 Process, User and System variables. The Windows process variables consist of Windows User and System variables.
The Windows 10 User environment variables are stored in the registry key below:
HKEY_CURRENT_USER\Environment
The Windows 10 System environment variables are stored in the registry key below:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment