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login using supplied user/pwd. 
 
Note that login must be the first command if used 
 - Parameters:
 - 
  
     | user  | username  |  
     | pwd  | password  |  
   
  
- Returns:
 - returns 
true on success   
Implements de.alysis.r.basemodel.connection.BaseConnection. 00129                                                                          {
00130                 logger.debug("login(String user, String pwd) called.");
00131                 try {
00132                         c.login(user, pwd);
00133                 } catch (RSrvException e) {
00134                         String message = "Exception from Rserve. ";
00135                         logger.error(message, e);
00136                         throw new ModelException(e.getLocalizedMessage());
00137                 }
00138         }
 
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