2.1.3 Can you answer these questions?

2.1.3.1 Purpose of DOTSB in definition of \iff
2.1.3.2 How can Bengali v.2 (bng2) be used to typeset Bengali with XeTeX?
2.1.3.3 Wireless network/nodes

Can you answer these?

2.1.3.1 Purpose of DOTSB in definition of \iff

http://tex.stackexchange.com/questions/285540/purpose-of-dotsb-in-definition-of-iff

What exactly is the purpose of the \DTOSB in the definition of \iff? There is a mention in  Is there a left-handed equivalent of \implies? that the \DOTSB makes \iff "dots aware". But, when I try to  ...
 
- asked by Peter Grill 6votes
2.1.3.2 How can Bengali v.2 (bng2) be used to typeset Bengali with XeTeX?

http://tex.stackexchange.com/questions/285527/how-can-bengali-v-2-bng2-be-used-to-typeset-bengali-with-xetex

This is a follow-up to this question about typesetting Bengali. 
As explained in both answers there, XeLaTeX can typeset Bengali given a suitable font using polyglossia and fontspec. For example, 
...
 
- asked by cfr 3votes
2.1.3.3 Wireless network/nodes

http://tex.stackexchange.com/questions/285582/wireless-network-nodes

I am actually using LatexDraw for my graphs. I would like to know if there is any package that provides wireless network components such as : base station, nodes, terminal, wireless signal, ... 
I am  ...
 
- asked by Kais 5votes