Question: What is the name of the person that forwarded information of interest to Group Headquarters?
About the article "Battle of Britain", section "The Dowding System".

Candidate passages:
Make Money Fast (stylised as MAKE.MONEY.FAST) is a title of an electronically forwarded chain letter which became so infamous that the term is now used to describe all sorts of chain letters forwarded over the Internet, by e-mail spam or Usenet newsgroups.
In anti-spammer slang, the name is often abbreviated "MMF". 
The general format of the field is:  X-Forwarded-For: client, proxy1, proxy2 where the value is a comma+space separated list of IP addresses, the left-most being the original client, and each successive proxy that passed the request adding the IP address where it received the request from.
In this example, the request passed through proxy1, proxy2, and then proxy3 (not shown in the header).
proxy3 appears as remote address of the request.
Since it is easy to forge an X-Forwarded-For field the given information should be used with care.
The last IP address is always the IP address that connects to the last proxy, which means it is the most reliable source of information.
X-Forwarded-For data can be used in a forward or reverse proxy scenario.
Just logging the X-Forwarded-For field is not always enough as the last proxy IP address in a chain is not contained within the X-Forwarded-For field, it is in the actual IP header.
A web server should log BOTH the request's source IP address and the X-Forwarded-For field information for completeness. 
Viral Messages refer to marketing messages that are passed from person to person through their Social Networks.
To create successful viral marketing messages, where success is defined as positive Return on Investment, marketers must:  identify individuals with high Social Networking Potential (SNP)  communicate compelling information that induces them to purchase the marketer's offer  communicate information that high SNPs are likely to pass on through their social network Communication of information in media that can be easily forwarded such as Internet videos, text messages (SMS) can effectively augment word of mouth transmission of the information throughout social networks. 
Reviews and commentary.
The FBI and "The Doorbell Rang".
Researching his book "Dangerous Dossiers: Exposing the Secret War Against America's Greatest Authors" (1988), journalist Herbert Mitgang discovered that Stout had been under FBI surveillance since the beginning of his writing career.
Most of the heavily censored pages he was allowed to obtain from Stout's FBI dossier concerned "The Doorbell Rang": About one hundred pages in Stout's file are devoted to the novel, the FBI's panicky response to it and the attempt to retaliate against the author for writing it.
The FBI's internal memorandum for its special agents told them that "the bureau desires to contribute in no manner to the sales of this book by helping to make it the topic of publicity."
Orders came from headquarters in Washington that any questions concerning the book should be forwarded to the Crime Records Division, thereby putting book and author in a criminal category.
An internal memorandum by Special Agent M.A.
Jones (name surprisingly not censored) summarized the novel and went on to write a critique for the FBI's top command — a rare "literary" honor accorded to few books in its files ...
Following the review came a series of recommendations — first, Stout was designated as a person "not to be contacted" without prior approval by FBI headquarters in Washington ...
In April 1976, the Church Committee found that "The Doorbell Rang" is a reason Rex Stout's name was placed on the FBI's "not to contact list," which it cited as evidence of the FBI's political abuse of intelligence information. 
These prefixes are usually inserted by the email client.
RE: or "Re:" followed by the subject line of a previous message indicates a reply to that message.
This is not an abbreviation, being the ablative form of Latin "res", and means "in the matter of".
* "re" (the ablative of "res" 'thing') has been used in English since the 18th century to mean 'in the matter of', 'referring to', 'regarding', or 'about'.
In business letters and memoranda, "Re:" may be used instead of "Subject:" to set off the topic.
FW: a forwarded message.
Also written as "FWD: ", "Fwd: " or "Fw: ".
The recipient is informed that the email was originally sent to someone else, and that person has in turn forwarded a copy of the email to him or her.
FYI: "for your information".
Also written as "Fyi: ".
The recipient is informed that he does not have to reply to this email.