what is pluggable adapter pattern

See more:

patterns

Hi,
I am a c++ developer and try to understand the design pattern .In structural pattern there is a specific pattern called adapter pattern.some how i understand this pattern from the GOF book.In this pattern ,there is pluggable adapter pattern,which very confusing and not able to understand it .Googled lot but not able to find a satisfactory answer.Can any one explain what is pluggable adapter design pattern ,with a c++ example ? and also the difference between normal adapter pattern and pluggable adapter pattern.
Thanks in advance