Using a Excel macro or VB to call up a WORD mail merge document

Have a workbook with numerous worksheets in it and one sheet as a data
source for WORD mail merge documents (two). Question is: Is there a way to
have a macro or VB routine to attach to a button that will allow me or end
user to select and then automatically pull up the WORD document and complete
the mail merge. Both Excel workbook and WORD document will be in the same
folder. Any help would be appreciated, Thanks
Bob Reynolds