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Practical Programming in Tcl & Tk, Third Edition
By Brent B. Welch

Table of Contents
Chapter 52.  Tcl/Tk 8.1


Serial Line I/O

The 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 that was annoying in previous Tcl releases.


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

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