gRSShopper looks for the domain of the request (eg., https://el2.mooc.ca). It then looks in cgi-bin/data/multisite.txt for a line beginning with that domain. This line defines the major site variables, including the name and login for the database.
multisite.txt is updated by the initiatize.cgi script. It detects the domain name it's running on, and associates it with the database values you enter into the form, and writes a line describing this.
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