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Update the Salesforce Records from External System by using Dataloader

Hi All,
I would like to update the Salesforce Records from External system, by using the Dataloader.
With Command line Dataloader, I am able to update/Upsert by using a single External Id field.
But i would like to use the Combination of two fields when doing the update in Salesforce, can we mention two fields in Process.conf file in Dataloader?
In Salesforce, we have two fields and based on combination of two fields (Composite Key), we will identify record as Unique record.
How Can i use these two fields combination, when I am trying to update records in Salesforce by using Dataloader command line?.