Find the "system.functions"

Hi, everybody and Happy New Year!
Could you tell me, wherein the settings can I find the library (or not, if it's not a library) like "system.functions.scmsg".
I know where the library(like a "lib.urlCreator") yet, but there are no "functions". So they are somewhere else.
I need to create a new email template for the dialog between HPSM and the users, managers etc. For this, all functions roots have a "system.functions...".
Please help me to find her