Doubt on technical systems and fault message types

Hi,

I had still doubt & i'm not clear to answers i got yesterday , plz clarify my doubts

1.what are fault message types and how do we catch any exceptions in file to proxy scenario , can any one give simple example ?

2.How do we register a non-sap system(FTP SERVER) in SLD ? what steps should we follow? Does any one have blogs regarding this?

Plz answer to this questions, good answers will be rewarded.