As stated in the website, the purpose of this project is to expand Gene Regulatory Networks, hence the first part of the name is trivial. In particular, at this moment we are working on the Arabidopsis Thaliana, which is a plant used as example organism in many projects.
The PC-IM exploits our knowledge of a certain network (Local Gene Network) and a file which contains some data obtained by experiments (Observation File). In order to perform further processing and analysis we need to link each workunit to the LGN and observations from which it derives.
For this reason, a pair of input files is identified by an xml files which is stored on the server. 1386239275.xml is the name of this file.
Moreover, from a single xml file we obtain more than a WU, hence we need a progressive number (the last part of the WU's name) in order to discriminate among different WUs related to a single input file.

I hope it is clear enough (but maybe it is not)