Vista - windows sidebar starts twice when adding extra gadgets to it

hello, i was going though some interesting gadgets online, installing some of
them, trying them out, uninstalling them. accidentally i found out that my
sidebar would lunch two sidebar.exe files every time i would load
extra-internet downloaded gadgets. when you close those gadgets and restart
the sidebar, only one sidebar.exe file will be lunched, but as soon as you
add an extra downloaded gadget another sidebar.exe file will pop-up in the
task manager window. my question is: Is this normal. Is side bar supposed to
lunch an extra sidebar.exe file when using downloaded gadgets, or did i mess
it up by playing to much with installing and uninstalling gadgets... i want
to make sidebar work with only one file again, because the second file takes
nearly as much memory as the first one... thank you