Enter two values for the GCD or LCM, then keep entering additional values. When you are finished, enter a 0 (zero). The program will calculate the GCD/LCM and display a matrix of all entered values and their respective ratio.

(Further info)
The LCM list is automatically sorted ascending. The GCD lets you choose whether you want it ascending or if keeping it in the original order is better (e.g. you are working w/polynomials)
This program stores values in lists so you can review the most recent entries even after you exit the program.
For the Greatest Common Divisor, it will display the value it found, as well as be saved at the bottom of the list "GCD", and a matrix of each value and their respective ratio if you are actually working with fractions.  There will also be an inquiry of whether you want it sorted "ascending" (if doing so will make the list/matrix more organized, or not if you want to keep the original order, perhaps because you are working with polynomials).
For the Least Common Multiple, it displays the value along with a matrix containing the original list of entries as well as each one's corresponding factor. This may be helpful if you are working with fractions and need to know what value the numerator and denominator need to be multiplied by.
The most recently calculated GCD and LCM are stored into the variable "G" and "L" respectively, if you need to use those values for a specific calculation.
There doesn't seem to be any restriction to how many values can be entered, except that how much RAM your calculator has, and that a single list can only have at most 999 elements.
Note that while the GCD and LCM operations have unique lists, which the program sets up in the Stats Editor, they both use the same matrix, [I]