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Built-in Mathematica Symbol

$CurrentLink

$CurrentLink
is the LinkObject representing the MathLink connection for an external program currently being installed or being called.

You can use $CurrentLink to distinguish between several instances of an external program running at the same time.

$CurrentLink can be included in :Pattern: and :Arguments: MathLink template specifications, and will be evaluated at the time when Install is called.

Set the directory:

Install two instances of external MathLink-compatible programs:

$CurrentLink is used keep track of different persistent variables: