GetUserKey
Pushes the current user key onto the stack.
<wf:Operation Name="GetUserKey" />
None.
String containing the current user key.
This operation is valid only in user track points.
The following sample contains an event filter expression that will evaluate to true
when the user key is equal to "DocumentUrl".
<ic:Filter>
<ic:Expression>
<wf:Operation Name="GetUserKey" />
<ic:Operation Name="Constant">
<ic:Argument>DocumentUrl</ic:Argument>
</ic:Operation>
<ic:Operation Name="Equals" />
</ic:Expression>
</ic:Filter>