1) when we upload a graphic from SE78 tcode its moved to 
application server

2) The report RSTXLDMC allows a TIFF graphics file to be 
uploaded from the file system of the R/3 GUI to a standard 
text in the R/3 word processor SAPscript

4)
Client                                                      
       is a there didgit number which we enter while 
logging which helps in data security by preventing the data 
from being visible to users in other client

1) A commercially, organizationally, and technically self-
contained unit within an SAP
system
2) Clients have own master records and set of tables
3) Client is the highest level in the SAP system hierarchy

I think 800 client is IDES server for traing purpose


5) END-OF-SELECTION is must 
        when there are Logical Database used in the program
        when STOP statemnt is used
        
and in cases where you need to change the O/P after 
printing for example if we need to print the page numbers 
in the form 1/10 its not possible directly but through end-
of-selection.

6) yes we can use.
     In the PF STATUS we must give the tcode PICK beside 
the function key F2 in freely assigned keys