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FRE                      Return Available Memory

 y = FRE({strexpr | -1 | -2})

    Returns the number of bytes available in Turbo Basic's string space,
    array space, or stack space.


     strexpr    FRE(strexpr) returns, in a long integer, the number of
                free bytes in string memory. The argument is a dummy; any
                string expression will do.

          -1    FRE(-1) returns the number of free bytes of array space.

          -2    FRE(-2) returns the number of free stack bytes.