ZenonSAR packs all the power of ZenonSA, but it's designed for I/O streams. The advantage of this over ZenonSA is that you can do more at once and solve problems faster than you ever could, even with a calculator or even ZenonSA!
You see, you can make a file containing a worksheet or a textbook page's worth of surface area problems in any text editor, such as Notepad, DOS Edit, etc., and use DOS I/O redirection with ZenonSAR to solve those problems almost instantly! On a 486/133, ZenonSAR can do 2000 surface area problems stored on a RAM disk in about the time it takes you to let go of the Enter key! On an HP95LX, a worksheet is small work.
Of course, ZenonSAR is under the GNU GPL, so you can tailor it to your needs and share it with your friends, unlike most other software, where you have to wait for some multi-billion dollar sloth to fix things, and the software police come after you if you share their stuff with a friend.