1. 
   COMM
   Communications
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   comm
   Communication
   Found op http://www3.sympatico.ca/dhaughey/j1930.htm
   
   
3. 
   Comm
   The comm command in the Unix family of computer operating systems is a utility that is used to compare two files for common and distinct lines. comm is specified in the POSIX standard. It has been widely available on Unix-like operating systems since the mid to late 1980s. ==Usage== comm reads two ...
   Found op http://en.wikipedia.org/wiki/Comm
   
   
4. 
   comm
   1) Abbreviation for communications 2) Ad hoc gp. 3) Census bureau's cabinet dept.
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/comm/1
   
   

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