Hi, Marie! I don't "program" disks the way they say you can in those gibberish-laden "instruction manuals".
What I do instead is load up all the discs I need for the mish-mosh in the player, cycle through each one getting to the point in the disc's workout I want it to begin, and then "disc-skipping" or disc-advancing to the next disc. My brand, a Sony Fossil 2K2, "marks" the point on each disc where it left off and "remembers" to resume playing the disc at that point when the machine comes to that disc again. Does that make sense?
This is very helpful especially when I want to begin a disc mid-chapter, as with MIC (I like to do only the ultra-high intensity hi/lo portion of MIC, about 18:35 minutes into the workout).
I know there's some freak way of "programming" workouts but I have no idea how to do it myself. My ham-fisted way seems to work pretty well for what I need.
HTH -
A-Jock