Set CALCINPUT to 1. At first when AutoCAD 2006 was released the End key was used to evaluate a function in an edit control. But because End also can be used normally to move to the end of the text in the edit control the End key changed in SP1 to Alt+Enter.
For those that want to try this draw a Circle, open Properties and select the circle. Enter something like =1000*1.4 in the edit box for the radius value. Then press Alt+Enter and the result will show up. No need to open the calculator in this case. This can also be used in dialog boxes like the one for the Array command