Handle to existing Excel document

[lcluff2000]

I'm trying to get a handle to an already open Excel document by name or by it being the active document (there may be more than one Excel document already open).

With this code:

Code:

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;/exe
ExcelSheet es1.Init
es1.SetCell("OK" 1 22)

I get the following error:
Error (RT) in Macro: invalid interface pointer. Use _create or other function to create or get object