Abbreviation or aliases

Hello,

Is it possible to use abbreviation or kind of aliases in docbook.

Let me explain : imagine you are writing the documentation of a  
software. The software name is long (Microsoft Excel 2005 for Palm  
Pilot) and it will appears many and many time in the text. Each time  
you type it you can make mistake. So the question is : is it possible  
to define somewhere ME2PP == Microsoft Excel 2005 for Palm Pilot and  
during processing ME2PP will be replaced Microsoft Excel 2005 for  
Palm Pilot, each time.

The product name is only a silly example. :-)

Thanks in advance,
Jacques