Texas Instruments TITANIUM TI-89 User Manual page 594

Scope Description
Folder Variables Variables that are stored in a particular folder.
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After the program stops, any folder variables created by
the program still exist and still take up memory.
Local Variables Temporary variables that exist only while a program is
running. When the program stops, local variables are
deleted automatically.
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Programming
If you store to a variable name only, it is stored in the
current folder. For example:
!
5 start
If you refer to a variable name only, that variable must
be in the current folder. Otherwise, it cannot be found
(even if the variable exists in a different folder).
To store or refer to a variable in another folder, you must
specify a path name. For example:
!
5 class\start
(class = Variable name; start = Folder Name)
To create a local variable in a program, use the
command to declare the variable.
A local variable is treated as unique even if there is an
existing folder variable with the same name.
Local variables are ideal for temporarily storing values
that you do not want to save.
Local
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