Password Change through external system

Hi,

I have Moodle installed on my web server to allow staff to collaborate. Is there a way to enable a change of password in the perch members app through this separate installation? Like, is there a createconnection() script or similar that needs to run to enable a connection to the perch database?

Basically I want to enable logging into different systems hosted on my web server using one password set through perch members. However, I wouldn't know where to start looking for database connection scripts and scripts to input data into the database.