Question: Who forwarded information of interest to Group Headquarters?
About the article "Battle of Britain", section "The Dowding System".

Candidate passages:
By this time, Haak was becoming well known as a gentleman-scholar with independent means and excellent family connections.
In 1634, Haak had formed an advantageous and lifelong relationship with Samuel Hartlib, a fellow German expatriate in London.
Since 1636 Hartlib had been in frequent correspondence with Johann Amos Comenius, who forwarded to Hartlib his manuscript, "De Pansophia".
In 1638 when Haak returned to England, he found his friend Hartlib engaged, intellectually and logistically, with Comenius and another Calvinist intellectual, John Dury (1596–1680).
Hartlib was a polymathic intelligencer, and the "Hartlib circle" reached into Holland, Transylvania, Germany, England, and Sweden.
France, however, was an obvious gap in his European network and Haak's French language abilities drew him to Hartlib, who knew that an informal philosophical group existed in Paris.
Its intelligencer was Marin Mersenne, a French theologian, mathematician, philosopher, and friend of Thomas Hobbes, René Descartes, and Blaise Pascal.
Haak initiated a correspondence with Mersenne in 1639, likely at the request of Hartlib.
His initial letter enclosed mathematical studies by John Pell and works by Comenius.
Mersenne replied almost immediately and although he briefly commented on Pell and Comenius, it was his request to Haak to send further scientific information that sustained their corresponding relationship.
The correspondence between Haak and Mersenne covered current scientific and mechanical subjects such as tides, the making of telescopes, spherical glasses, new planetary discoveries, magnets, cycloids, mills, and other machines.
The nature of the correspondence was somewhat of a disappointment to Hartlib, who was more interested in expanding Comenius's pansophic work.
Mersenne showed greater interest in English scientific experiments and results, and the correspondence between Mersenne and Haak did serv to connect a small group of interested philosopher-scientists in London to Mersenne’s scientific group in Paris.  
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. 
Preliminary identification of possible star candidates starts at the Haleakala telescope in Hawaii by a team of professional astronomers.
Once they identify a star that dims slightly from time to time, the information is forwarded to a team of amateur astronomers who then investigate for additional evidence suggesting this dimming is caused by a transiting planet.
Once enough data is collected, it is forwarded to the University of Texas McDonald Observatory to confirm the presence of a transiting planet by a second team of professional astronomers. 
Syntax: codice_70 Returns information about the comma-separated list of nicknames masks <nicknames>.
If <server> is given, the command is forwarded to it for processing.
Defined in RFC 1459 
From October 1940, ZOW sent numerous reports about the camp and its means of genocide to Polish resistance's Home Army Headquarters in Warsaw.
ZOW's first report reached the Polish resistance in November 1940.
A shortwave transmitter hidden in Block 11 also sent information directly to the Polish government-in-exile in London.
Beginning March 1941, Pilecki's reports were being forwarded via the Polish resistance to the government in exile and onwards to the British government and other Allied nations.
These reports were the first about the Holocaust and a principal source of intelligence on Auschwitz for the Western Allies.
Nonetheless, those reports were discarded as "too extreme" by Allied intelligence chiefs for much of the war.