Hi,
I'm not familiar with the particular instrument that you are talking about, but in general most instruments like this (i mean oscilloscopes, logic analysers and the like) support a data transfer of the display data. If you're lucky the instrument driver will have functionality to get this data. You would just need to re-constitute it into a graphical format on the PC...
V. basically, request the dataset, stick it in an array, and feed that array into a graph... simple??