Please explain the following terms-File handle/token, ASCII2

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INS-ANI

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handle token

Hello Every body.
I am learning to write programs based on file operation. the objective is to write a program to create,read,write,delete a file.
For that reason please explain the following terms, so that i can move on:s:
1) File Handle/Token
2) ASCII2



Also, I need to learn the following topics in 8086 Microprocessor

1) File Operations.
2) Printer interfacing.
3) PC to PC communication.
4) TSR (get data and get time).

I have completed basic instruction sets and few dos function calls which were required.(09h,01h,02h)
Please suggest
1)Which book/chapter to refer.
2)Is any additional Basics required for each of them?

Thanks In Advance
 

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