Evaluate the current User in a visual workflow

I created a Visual Workflow that launches after a user clicks a custom button on the Account page. I’m wondering if I can use Decision logic to evaluate certain attributes for the logged in user and their associated user page. Specifically I want to evaluate if the user (who clicked the button) is also the Account owner. If they are then it should take them to an input screen. If the user is not the Account owner, then I want to show a fault screen. How do I go about evaluating the current user?

Answers:

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Method 1

You should be able to use Global Variables for your scenario . Precisely you should be able to use {$!User.Id} to get the Id of the User executing the visual workflow.

Note that global variables are present in formula .So you can create a formula and assign to a variable

Method 2

You need to pass them as parameters to the flow. You can use an extension controller.

<flow:interview name="FEPlacementRequest" finishLocation="{!EndPage}" interview="{!placementInterview}">        
    <apex:param name="UserName" value="{!$User.FirstName}"/>
</flow:interview>

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