Storing a String
Storing a string on disk, permanently, is just as easy as using regular variables. Just use the ^ (caret) character as the first character of the variable name. The example saves a string in the variable ^x which is different than the regular variable x. Even if you kill all regular variables, ^x remains. ^x is a global.
USER>set x = 4
USER>set ^x = "Store this on disk"
Store this on disk