What does __config 0x3D18 do in Assembly language?

[lcs81]

https://obrazki.elektroda.pl/84_1178103868.jpg

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Line 1 LIST p=16F877A
Line 2 include "P16F877A.inc"
Line 3 __config 0x3D18
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What does the line 3 do?

What type of value we need to assign.

If we write a program in C, is line 2 necessary?[/img]

 

[cameo_2007]

Some assemble code

this is actually for the configuration bits..
if you can have look at the configuration data.. u can understand what it is.
In C, if you can read the help on the compiler,it will tell you what to do about the configuration bits.

Added after 2 minutes:

Line 2 is not needed while writing in C