Way to understand konqueror and different protocols

Hi, where can I look for examples on how konqueror handles specific and also customly defined protocols. Also how can I trigger konqueror with specific protocol - for example list directory and in this directory trigger a link to sftp connection? Also how specific device can appear on the side bar?

Especially I am interested how the connection to the remote device is managed and for example how it is terminated.

Thank you in advance

regards