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It looks like bartus11 has mostly answered your question. It is an sccs (Source Code Control System) ID comment. In this case it says that this script is version 1.11 and was last updated on...

tr ... < inputfile | command2

or, if you prefer it in front, that works too.

<inputfile tr ... | command2

x86 support didn't start with Solaris 10, the first non preliminary release, Solaris 2.1, was already running on x86 hardware in 1993.

This link (http://www.gnu.org/manual/gawk/html_node/Computed-Regexps.html#Computed-Regexps) might shade light explaining the difference between a regexp constant and a string constant