buses (and trains) in Nord Jylland

A while ago I asked about travelling by train from Copenhagen to Nord
Jylland and by bus within Nord Jylland. I was directed to the
"Rejseplanen" web site (where one can inquire for point-to-point
itineraries) and to the local public transport authority site
http://www.nordjyllandstrafikselskab.dk where one can find a route map
and timetables for individual routes.

I have however still a few questions :

1) One is a technical curiosity (for the misc.transport.* NGs) :
In the Rejseplanen output there is a "Journey" column which sometimes
contains a number (like 79) or a name (like Si-bus) which I believe
is a bus line. Some times (for trains) contains a code like PP 79,
or IC 123 ... which cannot be a train number because it is repeated
for different trains.

2) The other questions are practical : I can find numbered bus line
timetables on http://www.nordjyllandstrafikselskab.dk, but I cannot
find there those indicated as SI-bus on Rejseplanen.

What are they ? a different company ? has it a web site ?

Also I note there sometimes a line is indicated as "telebus" or
"teletaxi". What's that ?

3) concerning tickets, the above site reports the zone boundaries.
I cannot find reference for fares (at least in English).
I have been mentioned a touristcard (90 kr for 24 hrs on all buses
and trains in North Jutland) and a 10 trip card.

Is the latter similar to the Dutch strippenkaart system ? I.e. do
I understand correctly you stamp two strips as a minimum and one
extra strip for each zone from the third onwards ?

Are the strip tickets valid on any bus and any route, or depend on
the company, line etc. ?

Where are they sold ? On buses, at tobacconists, at post offices ?

Are the two private rail stretches (Frederikshavn-Skagen and
Hjorring-Hirsthals) covered by the strip ticket system, or do they
have joint tariffs with DSB, or are they altogether separate ?

4) I have been also told that people over 65 are entitled to 50 %
reduction - no documentation needed. Since I will be travelling
with my mother, and I do not expect all bus drivers to speak
English, what is the phrase in Danish to ask for "one normal and
one reduced" ticket ?

(do not worry about the pronounciation, I can ask on an italian
language newsgroup about that !)

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