How do I get an XY graph to auto append data?

"Here is my problem. I have a Visual C program getting info from a user. That info is appended to a log file everytime the user hits "enter". Now, my labview program has to display the data in a graph, but I only want to see the 30 most recent points. I am using Labview 6i profesional and any help would be veru much appreciated

Okay, what I had to once was read a file that was updated by a different program. I used a state machine where one state would read the entire file at some interval. If you wanted, you could also trigger a file read when the size changes. The contents of the file went into arrays using something like the Spreadsheet String To Array function. The last x number of points were extracted with the Array Subset function. The output of the Array Subset was fed into a shift register. In another state, I used the shift register to update the XY graph. What I've done for upper and lower limits is to set a couple of cursors to those values and display them on the graph.

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