Logon group are set using SMLG transaction. 

Load blancing:

During the request message server check for the least 
loaded instance in the group and route the request to that 
instance.

If instead of logon group we specify the instance then the 
request is routed to that instance only. Means no load 
balancing occur in this case.

The route between development to quality is called 
consolidation route.
The route between quality to production is called delivery 
route.
It is used to transport data dev-->qua-->prod.

CONSOLIDATION ROUTE:the route between development to 
quality is called consolidation route.

DELIVERY ROUTE:The route between quality to production is 
called delivery 
route.

For importing SP use 000 client. Other then 000 all other
clients are display only clients.
First of all its a nice question ... 
We need to apply the support packages through client 000
because in SAP R/3 we just have three default clients 000,
001, 066 and the most updated one is client 000 and thats
the reason to copy a new client or to create a new client we
copy it from 000 and we apply the support packages through
client 000 as its the most updated one in the entire system.

T-Code to apply support packages is SPAM
Also Support packs access SAP Objects. So it need to be done
only in 000.

package has to effect the entire system, it is not client
dependent.so, we install by login into 000 clent.

Transport domain is route of system from consolidation 
route and delivery route.

Domain sontroler is the system keep all the system domain 
transport of all system in landscape.

transport domain contains copy of reference configuration.
domain controller contains reference configuration
transport domain consists of all systems that you plan to
manage using stms. within transport domain all systems must
have unique system ids and only one of these systems is
identified as the domain controller
the transport domain controller is the system where all TMS
configuration settings are maintained.  any changes in to
the configuration settings are distributed to all systems in
the landscape 
a transport group is one or more systems that share a common
transport directory

OCS stands 4 :online correction system.Using SPAM ou can 
apply OCS patches.

use tcode snote.

log on to sap system on first screen (easy access) at top 
click on system then click on status there u can find the 
system is unicode or nonunicode

Through sm51 t-code we can see whether it is unicode or not.
in sm51 t-doe we can find the release notes button in the 
application tool bar if u click on that u can see the total 
information like database, os, kernal version and uniicode 
or non unicode.

Check status window from system menu from any SAP screen. 
SM51 is somewhat puzzy. Or at OS level issue disp+work -
version.

These are the two area we can use to check unicode or non-
unicode of the system.

Completely wrong.

We cant just see Unicode/ Nonunicode by typing disp+work.

go to kernel directory 
>cdexe
>disp+work

If the system is Unicode, it displays Unicode.
compilation mode              UNICODE
If the system is Non Unicode , it displays nothing. ( It is 
so important to specify this fucking shit !! )

Usually all ECC5 and higher version are supported by 
unicode.
old versions are all nonunicode.

Gunjan,

Your answer may be correct. But you should understand that 
these answers are read by worldwide so you should not use 
such an abusive language in this forum.
Like ( It is 
so important to specify this fucking shit !! )

more over gunjan has specified wrong.
All the versions after release Sap R/3 4.6C has a concept 
of Unicode.

no

No, we can`t maintain two fiscal year varient for same 
co.co. Yes in case of controlling we can maintain different 
number of special posing period.
 

Down payment is advance payment to vendors for 
supply/services.

It is not possible made down payment to one time vendor or 
one time customer

the transaction is SPDD.