The Assign action assigns a Value (VisualBasic Type) to a Variable.
where Z is a variable of type Int32 (Z is declared in the variables section* and given type Int32) and the value 4000 is of type Int32.
*the variables section can be found by selecting the 'variables' toggle button in the lower left corner of the workspace.
Name of the property
VB variable type (Int32, String, etc)
The variable to be given a value. The variable should be declared in the variables section in advance.
Expression which conforms to 'To' Property Type (see row above)
That VB expression which is assigned (Int32, String, etc.)