tolerant. Cluster computing environments like Condor
\cite{condor-practice} and volunteer computing systems like BOINC \cite{boinc} are loosely coupled and
have a scheduler that distributes tasks to computing nodes. Cluster
-computing environments assume that nodes are most often accessible
-which is not applies to volunteer computing systems.
+computing environments assume the fact that nodes are in general
+directly accessible, one to another, but this does not apply to
+volunteer computing systems.
XtremWeb-CH (XWCH) is a volunteer computing inspired large-scale
computing platform for distributed applications. In fact, it tends to
be a good compromise between cluster computing and volunteer
computing. It is originaly based on another platform called XtremWeb
- \cite{xtremweb}. It is easy to install and maintain and it is supported by a Grid
-middleware (ARC \cite{arc}) and a workflow engine (JOpera \cite{JOpera}). It consists in
-three components: one coordinator, a set of workers and at least one
+ \cite{xtremweb}. It is easy to install, maintain, and it is supported by a Grid
+middleware (ARC \cite{arc}) and a workflow engine (JOpera \cite{JOpera}). It consists in
+three components: one coordinator, a set of workers, and at least one
warehouse. Client programs use these components.
The coordinator is the main component of the XWCH platform. It
