This example activates Sheet1.
Worksheets("Sheet1").Activate
This example selects cells A1:C3 on Sheet1 and then makes cell B2 the active cell.
Worksheets("Sheet1").Activate
Range("A1:C3").Select
Range("B2").Activate
This example activates Book4.xls. If Book4.xls has multiple windows, the example activates the first window, Book4.xls:1.
Workbooks("BOOK4.XLS").Activate