formatting plots (markers and lines)

I have a program working and I get an x-y plot (2D line using MSChart). THe questions I have are:
1) I want to compare two similar equations on this plot (both share the same x and y axis), one will be a line, the other will be only markers. How do I set each plot to be different? I can set one to be a line, but I don't konw how to set up the other one to be just markers without the line (do I adjust the line thickness to zero, if so, how?)?
2) For future reference, how do I plot only markers and no lines?
[527 byte] By [marlonjc] at [2007-11-15 18:34:56]