Returns the value of an environment variable.
1.Environment - Name of the Macro.
2.Environment Variable - The name of an environmental variable to return. To view a list of potential variables open a command prompt, type SET, and press ENTER.
3.Default Value - An optional default value which, if no Environment Variable is returned, will become the value.
Returns the value of the environment variable SYSTEMDRIVE if it is present. If it is not present it returns an empty string.
Returns the value of the environment variable TEMP if it is present. If it is not present it returns C:\TEMP.
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