A variable value distribution has three available settings

Scope

The value scope can be:

Local: The values are specific to each Virtual User.

Global: The values are shared among Virtual Users.

Unique: Identical to Global, with the guarantee that a value is only used by a single Virtual User at a time.

Order

Values may be distributed in a set order:

Sequential: Values are taken in the order they are defined.

Random: Values are taken in random order.

Any: Best effort sequential order. This order is more efficient than sequential order.

When no values are left

Several policies can be applied:

Cycle: The values are used over again, starting from the top.

Stop test: The load test run is stopped when all the variable values have been used.

Return the value "": All subsequent requests for values return this value.

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So, if you want to ensure that it is less likely any values are shared, you would use "Unique" for Scope, and "Any" for order. The use of shared values between two or more virtual users depends on if you have enough values total. And, if you run out of total Unique values (When no values are left), what do you want to happen (See above). This info is from the following document:

http://www.neotys.com/documents/doc/neoload/latest/en/html/#1058.htm#o1061