Questions arising while designing Payment Detection Usecase of Alkimia

1. How will the data be accessed for the 'USER' and other entities?
   
   
2. What is the use of "pluginsDir.cdUp();"?
   
• bool QDir::cdUp()
  Changes directory by moving one directory up from the QDir's current directory.
  Returns true if the new directory exists and is readable; otherwise returns false. Note that the logical cdUp() operation is not performed if the new directory does not exist.
  reference: http://doc.trolltech.com/4.2/qdir.html#cdUp
  
  
3. The whole statement is as shown below
   pluginsDir.cdUp();
     if (!pluginsDir.cd("plugins")) {
       qWarning() << "SymbolManager: Couldn't find plugin directory";
       return;
     }
   I do have the directory named "plugins" but still it is giving me the error as shown in the code
   "SymbolManager: Couldn't find plugin directory"
   I don't know why
   
4. What exactly does the 'symbol' refers to? How it is related to the user?
   
   A stock symbol or ticker symbol is a short abbreviation used to uniquely identify publicly traded shares of a particular stock on a particular stock market. A stock symbol may consist of letters, numbers or a combination of both. "Ticker symbol" refers to the symbols that were printed on the ticker tape of a ticker tape machine.
   Reference: http://en.wikipedia.org/wiki/Tilcker_symbol
    
5. What is the use of Q_OBJECT macro?
   
   Please refer to the page http://summer-opensource.blogspot.com/2011/06/what-is-use-of-qobject-macro.html