Display the help pages for installed packages that match the supplied pattern in an HTML browser window.
showHelp(pattern="methods", ...)string pattern to match to package names
allows user to specify two additional arguments: 
    remote - character string giving a valid URL for the R_HOME
    directory on a remote location; 
    update - logical: if TRUE, attempt to update the package
    index to reflect the currently available packages. 
    (Not attempted if remote is non-NULL.)
A list is invisibly returned, comprising:
all packages installed on user's system
selected packages based on specified pattern
path and file name of HTML Help Page
The specified pattern is matched to R-packages installed on 
  the user's system. The code uses the utils 
  function browseURL to display the HTML Help Pages using 
  a browser that the system associates with html 
  extensions. (See help for browseURL for other operating systems.