Need Answers to Questions Please

Hi Experts,

The questions were asked in one of the interviews, Need Answers Please

1.Can we run a job in central repository?

2.Which one is best- Shared,FTP,Custom and Direct Download?

3.What is the  sequence of existence of  Look up  Functions For example which one come first,  Look up or look up_ext or Look up_seq ?

4.What are the SAP Business Suite  tools ?

5.What are Idoc types?

6.What is the actual difference between Batch and real time job not in terms of concept actually difference ?

7.

I have data in a File i want in the output as   for example

M

MA

MAD

MADH

MADHU

How to achieve this ?

Thanks

Madhu