Changes to Tcl between r6 and r7

'''Tool Command Language'''

Tcl is a dynamic programming language that is available on many platforms.  Tcl is very flexible and consistent.  For example, you can re-implement the "if" command within Tcl (see [Reimplementing the If Statement in Tcl])

Tcl's flexibility makes it easy to implement other languages directly in Tcl, see for example: [LOLCODE in Tcl]
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Some links:
'''Tcl Documentation'''
   * Tcl Cheat Sheet [] (PDF [])
   * [Tcl and Threads]


     Only in r6
     Only in r7
     -->      Modified slightly between r6 and r7