Hi,
sorry for this delayed reply.
I remember I could do a poke with more than one column of data but it was rather tedious. Can't find the VI at the moment. Normally I use a simpler approach, i.e. I use an intermediate (temp) ASCII file for data transfer.
The method is used in the attached "Extract data from graph control.vi" (it's in the .llb within the .zip). It is a nice tool which allows to extract data from any graph control in any open Labview window and send these data to (an open instance of) Origin.
There is another (unrelated) VI in the .zip which demonstrated how to query an Origin variable from Labview.
Hope this helps...
Franz