Reading different specifications and manuals I've noticed that more often and often pronouns she or her are being used when some unknown person's behavior is described.
For example: "when user opens the first screen, let she be notified about something" or "let user input her address". Actually, I've seen more versatile examples but cannot remember anything nice now.
Is it a last-years tendency? Or is it something only UK-specific? Are there any rules about it? Or, maybe, is it applicable only for written document/spoken language?
I'm not an informant (as you've already guessed) and it's very important to me how should I write in official correspondence with British/US customers and not to hurt their feelings?