I have a command button labeled "Edit Letter" to enable my users to edit letters used within my app. I am trying to properly launch only a single instance of Word. Currently in the click event, I have:

LOCAL lcDocument
lcDocument = FULLPATH("letters\pcb"+ This.Parent.cboLetterType.Value+".doc")
oWord = CreateObject("Word.Application")
oDoc = oWord.Documents.Open(lcDocument)
oWord.Visible = .T.

I understand that with this code, if the user clicks the button a second time without closing Word, a second instance is created thereby consuming memory. Now according to VFP Documentation AND Tamar Ganor's book MS Office Automation With VFP, I should be able to use the GetObject() function to either create an instance of Word if needed or if Word is already started, simply open the document. I have tried the following with the same assignment as above to lcDocument:

oDoc = GetObject(lcDocument)
oDoc.Visible = .T.

The second line returns an "OLE error code... Unknown Name."

I've tried

oDoc = GetObject(lcDocument, "Word.Application")
oDoc.Visible = .T.

The first line returns an "OLE error code....No such interface supported."

I'm just not understanding the GetObject() function. Isn't this what I want to use prevent the second launch of MS Word?

Thank you very much