Hi Murielle,
The InSQLPCo Connector is added in MII to leverage the data from Wonderware® IndustrialSQL Server (InSQL) in Plant Information Catalog(PIC).
Earlier than MII 14.0 SP4, PIC was only supporting PCo Data servers, so this InSQLPCo Connector was added so that PIC supports the InSQL Data servers as well.
So to sum up, InSQLPCo Connector is just like InSQL connector connecting to Wonderware® IndustrialSQL Server but of connector type as PCo so that it is supported in PIC.
Differences in usage for query templates is explained by Steve in the earlier reply.
Regards,
Rohit Negi.