Application.ExecuteExcel4Macro

This registers the function only for that particular workbook
Runs a Microsoft Excel 4.0 Macro function and then returns the result of the function
The return type depends on the function called
This function has no context associated with it so any references or names must be fully qualified and specified

Running a Macro

This will only work if the workbook name is specified

Public Sub MyMacro() 
Dim myreturn As Variant 
   myreturn = Application.ExecuteExcel4Macro("Book1!RunThis()") 
End Sub 
Public Sub RunThis() 
   MsgBox("hello") 
End Sub 

Position of a Cell

This returns the horizontal distance in points from the left edge of a cell to the left edge of the window

Application.ExecuteExcel4Macro "GET.CELL(42)" 

This returns the horizontal distance in points from the right edge of a cell to the left edge of the window

Application.ExecuteExcel4Macro "GET.CELL(44)" 

Calling a Worksheet Function

You could even use the following although this is not very common

x = Application.ExecuteExcel4Macro("Sqrt(4)") 

Other Examples

If your string contains double quotes then you must use two double quotes in your text string

Application.ExecuteExcel4Macro "Get.ToolBar(7, ""Ribbon"")" 
Application.ExecuteExcel4Macro "Show.ToolBar(""Ribbon"", False)" 
Application.ExecuteExcel4Macro "UNREGISTER(""MyAddin.xll"")" 
Application.ExecuteExcel4Macro "GET.DOCUMENT(50)" - returns the number of pages to be printed 

On a Macro4 Worksheet

CallFunction
=RESULT(7)
=CALL("Kernel32","GetTickCount","J!")
=RETURN()