MSPSetDefault

MSPSetDefault[ var,value]

sets the variable var to value if it does not have a value.

Details

	MSPException["ParseError"]	if the value cannot be interpreted by the Wolfram Kernel
	MSPException["SecurityError"]	if the value does not pass the security test
	MSPException["ValueError"]	if the value is not a string; this indicates a programmatic error by the page author
	MSPException["VariableError"]	if the variable is not a Wolfram Language symbol; this indicates a programmatic error by the page author

You can simulate how the function works by loading the package:

Here, $$var has a value, so its value is not modified:

If $$var has no value, MSPSetDefault will set it:

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