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TCP vs UDP

TCP
is analogous to telephone
- connection oriented

UDP
is analogous to passing a note from one computer to another computer.
- connectionless protocol
- maximum data size of individual sends is determined by the network

Question to choose between TCP or UDP
1. Require acknowledgement?
2. Sending big file(Such as image or sound file?)
3. Intermittent?

C / visual basic / COM and windows

Many the low-level function created using C.
All of the DLL in win32 API were implemented in C code

Visual basic tend to be windows only programming language.
Visual basic use different data types and differently store then C.

 Visual basic uses stdcall convention for implementing function call.

COM
Com takes object-oriented programming paradigm to the next level by using standard class.

Com client can be written in any language that support object oriented programming.

Tasks controlling hardware of PC

1. Sending beep to speaker
2. Ejecting CD/DVD-ROM

The simple computer model

cmp : compare a register to a value, raise a flag

section .data
store variable

section .bss
Used for reservation

section .text
Used for actual codes

Composer

1. Write your code using notepad
2. Save it as .asm file type
3.