Syntax/format of id files and file names

Hi,

Does someone knows the syntaxof the id name and the mailfile name? may the only consist numbers and letters? or also other characters? are there minimum/maximum length og these names?

Is this mentioned somewhere in the help documentation on the internet? I could not find any official info on this

Regards

Subject: depends on the operating system

So is restricted by operating system limitations, which varies from OS to OS