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Example : I would like to write ABCD on Screen. How can I do this ?
Simple First create 5 Text Actors : Helper, FirstLetter, SecondLetter, ThirdLetter and FourthLetter.

On Helper :

Add Event CREATE ACTOR, add Script and write :

int KeyDown = 1;

Add Event KEYDOWN (any key), add Script and write :

KeyDown ++;

On FirstLetter :

Add Event KEYDOWN (any key), add Script and write :

char * Letter = GetKeyState();
if ( Letter[KEY_a] == 1 && KeyDown == 2)
{
strcpy (FirstLetter.text , "A");
EventDisable ("FirstLetter" , EVENTKEYDOWN); \\ to have the key pressed only once
}
else if ( Letter[Key_b] == 0 && KeyDown == 2)
{
strcpy (FirstLetter.text, "B");
EventDisable ("FirstLetter" , EVENTKEYDOWN); \\ to have the key pressed only once

}
else if ( Letter[Key_c] == 0 && KeyDown == 2)
{
strcpy (FirstLetter.text, "C");
EventDisable ("FirstLetter" , EVENTKEYDOWN); \\ to have the key pressed only once

}
else if ( Letter[Key_d] == 0 && KeyDown == 2)
{
strcpy (FirstLetter.text, "D");
EventDisable ("FirstLetter" , EVENTKEYDOWN); \\ to have the key pressed only once

}

What you do on SecondLetter, ThirdLetter or FourthLetter actors is the following :
Just Replace "FirstLetter" in the code above by the corresponding Actor's name e.g SecondLetter Actor > SecondLetter.text in Script.
Replace the following conditional value of integer variable KeyDown for each actor :
For SecondLetter > KeyDown == 3;
For ThirdLetter > KeyDown == 4;
For FourthLetter > KeyDown == 5;

Fine, now test it !