Environment variables are a set of strings that can affect the way running processes and applications will behave on a computer. The strings can contain information about drive, path, file name, etc.:

%DATE% This variable expands to the current date. The date is displayed according to the current user's date format preferences.

%TIME% This variable points to the current time. The time is displayed according to the current user's time format preferences.

%AppData% Contains the full path to the Application Data folder.

%ProgramFiles% This variable points to Program Files directory. The default is C:\Program Files.

%CommonProgramFiles% This variable points to Common Files directory. The default is C:\Program Files\Common Files.

%SystemDrive% This variable value is the drive upon which the system folder was placed.

%USERNAME% This variable displays the active users login.

%WinDir% This variable points to the Windows directory.

More information about environment variables find in the Windows documentation.

You can add, modify, or remove a user environment variables.

Select the "Set environment variable" item from the Actions list:

Set environment variable

"Add new environment variable" - press Add button and enter the variable name and value.

"Edit environment variable" - select existing variable in the list and press Edit button.

"Remove environment variable" - select existing variable in the list and press Delete button.

Environment variables window

"Condition" (on the Actions page) - see System of Conditions topic.

"Title" - a name of the item displayed in the Conditional Actions or Targets and Actions lists. The field can be blank.