# 5 Mozart 1.2.2

Mozart 1.2.2 is an improvement release and is fully backward compatible with Mozart 1.2.1

- Improved debugging support for `for` loops: they now provide meaningful debug info and can be stepped in

- Reference documentation added to TkTools

- Windows:

  - Release 1.2.1 for Windows omitted file `cache/x-oz/contrib/os/mode.ozf` which is required by the GDBM contrib. This is now included.

  - `OS.uName` now correctly fills `machine`, `release` and `version` fields; Before, they always contained `"unknown"`, and provides more information in the `sysname` field. Before, the `sysname` field always contained `"WIN32"`; it is now `"win32s"`, `"win32_windows"` or `"win32_nt"`.