Stapler-
No, they don't warn you, wouldn't that be nice though!
The program I use (Reef Con), you can set up different tanks, I have my main (display) tank, and my QT. You enter the tank dimensions, Manufacture, type (SW, FW, even Reptile). You are able to enter the equipment you use on your tank and, the fish, coral, and inverts. It has a reminder that you can use for water changes, med. dosing, water test, etc. There is an area that you enter your water test results, a health section, expense area, and more. You can use the few pictures they have in the program or your own (for the inhabitants in the tank). You should check it out, I really like it. Keeps my desk neater since I don't have water test sheets laying around anymore!
The second program is basically the same only its a little fancier, that one has a disease area you can look up symptoms and it includes pictures, etc.