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Help with making a PC oscilloscope , graphing display how??

Hi I have built a simple A/D converter that connects to the PC's lpt port and i have stored the values in a array,
i want to display these values as a oscilloscope type display, anyone point me at a bit of sample code for generating such a display?
many thanks

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Bob Learned
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Thanks to both of you for the help, i have split the points as although im not using TheLearnedOnes answer it will give me  some pointers for more complex stuff when im ready.
Thanks to both of you.
Regards
Paul