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EPUB (short for electronic publication) is a free and open e-book standard by the International Digital Publishing Forum (IDPF). Files have the extension .epub.




Web cache:

Google's cache link in its search results provides a way of retrieving information from websites that have recently gone down and a way of retrieving data more quickly than by clicking the direct link.


email from PayPal - how do I know if it's genuine?

phishing email, forward it to


In spite of its international reach, PayPal has limited functionalites for multi-country users, most notably the impossibility to have bank accounts in several countries, or to have a shipping address in a different country than one's bank account / credit card.

PayPal Mafia



Get an OpenID®

users can log into multiple unrelated websites without having to register with their information over and over again

Social networking


2veritasium critically compares it's pay-to-promote a post to YouTube's monetisation model.

Notifications Settings - turn them off, fiddly though it is, and don't get swamped with uneccessary notification emails…



Video Settings

Advanced > Creative Commons License > Attribution - is what I use.

Privacy is where you can:

  • make your video hidden to anyone who ain't got the password (like this)
  • disallow embedding of your video on other people's websites
  • disable comments

Online Resources


Project Gutenberg:

Goodreads A great place to share your reading.

You can get widgets, like this one for email:

Check out my books on Goodreads: <a href=""></a>

- which appears as Check out my books on Goodreads:

Quora > Quora aggregates questions and answers to topics. Users can collaborate by editing questions and suggesting edits to other users' answers.


Database download:

Featured articles - the list of those that are considered the best.

If you want to contribute to different language versions, you can use the unified login.

Reusing Wikipedia content

Licensing notice: Each copy or modified version that you distribute must include a licensing notice stating that the work is released under CC-BY-SA and either a) a hyperlink or URL to the text of the license or b) a copy of the license. For this purpose, a suitable URL is:

Statistics - why it would take at least 7 years to read!

Too long; didn't read - an insight into how it works.

.io [Indian Ocean Territory] domains are popular with new startup companies.

Google Web Search Features - are fairly snazzy, like this: define World Wide Web, or search for my play ("Et si Léonard") within the producing compnany's site:


- that's a Google search for leonard within the site

Stack Exchange Network

A pictogram of their sites

a network of free, community-driven Q&A sites
created by the founders of Stack Overflow

Create an account to be able to put questions and answers, if you have them on their sites:

Stack Overflow

Peer-to-peer (P2P) networks

BitTorrent protocol

BitTorrent is one of the most common protocols for transferring large files, and peer-to-peer networks have been estimated to collectively account for approximately 43% to 70% of all Internet traffic (depending on geographical location) as of February 2009

Deluge - from Ubuntu guys. Available for Linux, Mac OS X and Windows. It's my preferred client. In MSWin, it picks up a click on a torrent in a web page.

When you know you've finished with a torrented file, better to remove it, or Deluge will try to start it whenever you fire it up.


Google Account

Google Wallet:

YouTube: "Kids are supposed to be 13 years old to use YouTube."

Google Calendar

It's so handy if you've Android devices, and easy to use, except searching, or getting stuff out of it ain't as straightforward as it seems. My preference is to:

  1. go to an Agenda view
  2. More > Print
  3. tick on Print descriptions - they're always off, and I always want them on
  4. for Range first select a start date, then an end date
  5. (this is a configuration: Print > Destination > Save as PDF then Cancel)
  6. Save As - which gets a pdf, nicely named by the date range.
  7. Cancel (to get out of the Calendar Print Preview dialog)

Keyboard shortcuts


  • j or n for next date range
  • k or p for previous
  • t for today

I set mine for 3 week custom view, then:

  • a = agenda
  • m = month view
  • x = custom view

Time zones are switched intelligently.


Google Drive

  • folder upload works fine if you're accessing it from Chrome, but from Firefox you get a limited functionality only if you install a Java applet (which my version of Java claimed was insecure).
  • My Drive You access with your gmail address, and get 15GB of online storage for free!
  • Google Photos is where many can be selected and dragged to the Bin.
  • sharing stuff is what I mostly use it for. Big upload filesize limit (10GB last time I looked) so you can put a huge encrypted zip there, if you've got the broadband upload capacity. You get a link for the shared folder, and anyone who goes to that link can easily download the contents without having to sign in.
  • sync Artem Russakovskii's discussion and responses explain why shouldn't use Drive as a Sync service.

Google Docs, Sheets, and Slides

Google Docs editors Help Center

(,_Sheets,_and_Slides) is the snazzy part. It can convert a huge range of files into a form that can be viewed or changed online. Pics are displayed nicely, and EXIF orientation tags are respected, but > Your Content in our Services is what you should check.

Offline access via Chrome - could be useful if you need to get at some Google Docs while not connected to the internet.

Sheets - your spreadsheets. Work with sheets, rows, and columns. Google spreadsheets function list.

Infrastructure Technologies

Hypertext Transfer Protocol

HTTP functions as a request-response protocol in the client-server computing model. A web browser, for example, may be the client and an application running on a computer hosting a web site may be the server. The client submits an HTTP request message to the server. The server, which provides resources such as HTML files and other content, or performs other functions on behalf of the client, returns a response message to the client. The response contains completion status information about the request and may also contain requested content in its message body.

MAC address

A media access control address (MAC address), also called physical address, is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet and WiFi. Logically, MAC addresses are used in the media access control protocol sublayer of the OSI reference model.
MAC addresses are most often assigned by the manufacturer of a network interface controller (NIC) and are stored in its hardware, such as the card's read-only memory or some other firmware mechanism. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number and may be referred to as the burned-in address (BIA). It may also be known as an Ethernet hardware address (EHA), hardware address or physical address. This can be contrasted to a programmed address, where the host device issues commands to the NIC to use an arbitrary address.
The original IEEE 802 MAC address comes from the original Xerox Ethernet addressing scheme. This 48-bit address space contains potentially 248 or 281,474,976,710,656 possible MAC addresses.


https - use it where you can!

OAuth “an open standard for authorization”

RSA (cryptosystem)

In such a cryptosystem, the encryption key is public and differs from the decryption key which is kept secret. In RSA, this asymmetry is based on the practical difficulty of factoring the product of two large prime numbers, the factoring problem. RSA is made of the initial letters of the surnames of Ron Rivest, Adi Shamir and Leonard Adleman, who first publicly described the algorithm in 1977.

Transport Layer Security (TLS)

Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols designed to provide communication security over the Internet.
The TLS protocol allows client-server applications to communicate across a network in a way designed to prevent eavesdropping and tampering.

Uniform resource locator (URL)

The Web is indexed with crawlers that look at URLs

(also known as web address, particularly when used with HTTP), is a specific character string that constitutes a reference to a resource.

Internet media type - developed from Multipurpose Internet Mail Extensions (MIME)


(Multi-Purpose Internet Mail Extensions) is an extension of the original Internet e-mail protocol that lets people use the protocol to exchange different kinds of data files on the Internet: audio, video, images, application programs, and other kinds, as well as the ASCII text handled in the original protocol, the Simple Mail Transfer Protocol (SMTP).


Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.
Base64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data. This is to ensure that the data remains intact without modification during transport. Base64 is commonly used in a number of applications including email via MIME, and storing complex data in XML.


MHTML, short for MIME HTML, is a web page archive format used to combine resources that are typically represented by external links (such as images, Flash animations, Java applets, and audio files) with HTML code into a single file. The content of an MHTML file is encoded as if it were an HTML e-mail message, using the MIME type multipart/related. The first part of the file is normally encoded HTML; subsequent parts are additional resources identified by their original URLs and encoded in base64. This format is sometimes referred to as MHT, after the suffix .mht given to such files by default when created by Microsoft Word, Internet Explorer, or Opera. MHTML is a proposed standard, circulated in a revised edition in 1999 as RFC 2557.

Internet Protocol Suite

The Internet protocol suite is the networking model and a set of communications protocols used for the Internet and similar networks. It is commonly known as TCP/IP, because its most important protocols, the Transmission Control Protocol (TCP) and the Internet Protocol (IP), were the first networking protocols defined in this standard. It is occasionally known as the DoD model, because the development of the networking model was funded by DARPA, an agency of the United States Department of Defense.

List of TCP and UDP port numbers

Internet Protocol

You can Ping

to test the reachability of a host on an Internet Protocol (IP) network.

Address Resolution Protocol (ARP)

is used to convert an IP address to a physical address such as an Ethernet address

IPv6 and Google's statement.

You don’t have IPv6, but you shouldn’t have problems on websites that add IPv6 support.


Dynamic Host Configuration Protocol

is a standardized networking protocol used by servers on an IP network to allocate IP addresses to computers. The purpose of DHCP is to automate the IP address configuration of a computer without a network administrator. IP addresses are typically selected from a range of assigned IP addresses stored in a database on the server and issued to a computer which requests a new IP address. An IP address is assigned to a computer for a set interval, after which, the computer must renew the IP address or acquire a new one.
After the client obtains an IP address, the client may use the Address Resolution Protocol (ARP) to prevent address conflicts caused by overlapping address pools of DHCP servers.


Address exhaustion

For example, the address of the loopback interface, usually assigned the host name localhost, is It consists of the four binary octets 01111111, 00000000, 00000000, and 00000001, forming the full 32-bit address.

online/online.txt · Last modified: 2016/09/27 20:49 (external edit)