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i assume you mean callback like:

Код:

public functionname(){
}

and stock like this:

Код:

stock functionname(){
}

going on this basis differences.

public has to be forwarded and is used for calls to the function to do something

example: Send a Message after a timer, run a script such as connect to a database etc.

stock does not need forwarding and works the same way as a public, i use the stock for commonly required functions such as my stock i made recently to create a car at a distance from me for a cost

Код:

MakeVeh(playerid, type, vehiclemodel, cost, distance);

Although you can use a public in the same way you use 1 less line and it cant be included from a file with stocks in (#include stockfile)

I hope thats right but thats my understanding