Help in 4GL

Hi, While using an Input Array or a Display Array statement ,I want to perform some task,if the user presses any key eg.,(aA-zZ|0-9).Can i do this in an ON KEY clause?If yes then how? I do not want to use a Prompt Statement because it takes the cursor out of my screen array. This need arises because I want to trap the key pressed by the user.While the user is in a field,i want to perform some task depending on the key that has been pressed by the user in the field. If fgl_lastkey() is to be used,in which clause should i use it and how? In case I were to use the after field clause /before field i end up with the value of "RETURN" or Arrow Keys. Thanks in advance, ****************************************************************************** S.Sathish email :ssathish@cmcbang.ernet.in ******************************************************************************