David,
In the agent desktop, I suppose I have to be logged in order to call GetAllSkillGroups(), so I added m_pCtiSession-->GetAllSkillGroups()  in the OnSkillGroupStatisticsUpdated event (but I am calling it only once). However, it returned duplicate groups, such as this:
(skillgroup.5022.3657.0:skillgroup.5022.3657.0 skillgroup.5022.915.0:skillgroup.5022.915.0)  where 3657 and 915 are my skillGroups. But why do they appear twice?
Thanks.

1. Priorities were 0 for all groups when we were on 7.5(6); now we upgraded to 7.5(10) and DumpArgs don't display priorities anymore, so I assume they are still 0. I don't see any difference between the groups besides the difference in IDs.
2. Also, I notice that GetAllSkillGroups() returns all 7 groups I am setup for; then I logout/disconnect/exit the app and start over and this time GetAllSkillGroups() returns only 2 groups; then I exit out and start over the app again and it returns only 1 group.  Why does it behave like that?
3. Another thing: maybe in VB, GetAllSkillGroups() returns array of skillgroups like you said, but according to the docs, in C++ and Java/.NET, it returns an array of Arguments, so I can't simply take the length of it like in VB. 
4. And the last observation: I see that in 7.5(10) the array that holds skillgroup statistics is called 'Stats', not 'Statistics' as in 7.5(1) or 7.5.(6); also the names of the the variables in that array changed as well, 'AgentsLoggedOn' in 7.5(6) became 'AGsLogdOn' in 7.5(10).  I noticed this when I was doing DumpArgs. Is this change just for displaying purposes? My code still refers to 'Statistics' and to 'AgentsLoggedOn', but I am running 7.5(10). All seems to work fine, but I am curious if I should change the naming in my code?
Thanks.

David,
I am enabling stats for all skillgroups. Using numElements did return the number of skillGroups even though when I print out the groups, they appear to be duplicated. However this total number may be different every time I start the C++Phone app (if I am lucky, I may get the correct total number from the 1st time, but most of the time I am not lucky). I noticed that on the CTIOS Agent Desktop, the list of skil groups doesn't appear at once, there is some delay and I see only few groups appear at first, then I wait a bit, then few more appear until all are displayed. I don't know why such a delay, but it means I have to call GetAllSkillGroups more than once, so I put the call into OnSkillGroupStatisticsUpdated event and now it's going to be called every time for every skillGroup which is not efficient.
Another problem is when I call .Release() after calling GetAllSkillGroups, it gives me a reference count of 2 and since I am callling it for every skill group, the reference count keeps growing by 1 every time OnSkillGorupStatisticsUpdated event is executed. Here is the code:
Arguments &groups = Arguments::CreateInstance();
groups = m_pCtiSesson->GetAllSkillGroups();
int totalGroups = groups.NumElements();
unsigned long errCode = groups.Release();
If I call errCode=groups.Release() 3 times so it returns 0, the app crashes when onSkillGroupStatisticsUpdated event is executed 2nd time. It seems to crash on the line groups=m_pCtiSession->GetAllSkillGroups().  Looks like .Release() affects something it shouldn't because calling it once or none at all, doesn't make the app crash.
Any thoughts about all this?
Thanks.

David,
In the 7.5(1) guide I read that To retrieve skill groups WITHOUT enabling skill group statistics, turn off agent event minimization by setting its value to 0 on the CTIOS server in the registry key. I DO enable skill group statistics, so I don't have to make changes on the server. Am I reading it right? 

David,
If I print out rArgumens in OnConnection Event, the EvtTime parameter displays, I assume, a number of seconds of some sort. What's the starting point for the count of seconds? I am actually looking for a way to convert this time to a readable format.
Thanks,
Arthur. 
 

David,
I connected around 10am EST, so the EvtTime should show a number around 36000, but it shows 18629898.

Thanks David.  Miliseconds makes sence now.

I am not aware of any issue calling the request more than once, but maybe you should place the request somewhere where it will be called once.

Yes, See Chapter 4 of the CTIOS Developer Guide section on Configuring the Agent to Automatically Log In after Failover:

If you are using CTI OS in an Unified Contact Center Enterprise (Unified CCE) environment, you can
configure the agent to automatically relogin in the event of a failover.
To configure the agent to log back in automatically, add the CTIOS_AUTOLOGIN keyword with the
value “1” to the Arguments instance used to configure the agent:
rArgs.SetValue(CtiOs_IKeywordIDs.CTIOS_AUTOLOGIN, “1”);

It would appear the statistics EnableSkillGroupStatistics request is cached between CTIOS Servers.