Strings in Variables

[Pilzinsel64]

This I found in the Script-Help-Document:
"When you define a local/global variable,you also defined a String type local/global variable with the same name!For the use of this string type variable, we will explain later."

But in the complet document i can't found any things about variables with string typ. There isn't explained later!
How to use local/global variables as string and not only as double?

[Yave Yu]

Str(name) for local string type variable
Gstr(name) for global string type variable