The title has an explainatory. If you have no idea what the title means well... look at the picture.
How many codes that works with sysval ? Well like the things that will not work like sysval(disablegrab) will cause an error which mean it is not possible to do.
EDIT: If I put this on a wrong topic/category, some staff(why did i typed "stuff") are free to move my topic that I'm posting.












