Miscellaneous

Serial Line I/O

The Windows serial line drivers were converted to use threads, so you can wait for I/O with fileevent when using serial devices. There is no API change here, but this was a limitation on Windows that was annoying in previous Tcl releases.

tcl_platform(user)

The tcl_platform(user) array element records the currently logged in user. This masks differences in environment variables and system calls used to get this information on different platforms.