4GL monitoring program

Does anybody know how to make user-interaction possible in Informix 4GL without waiting for the user to press a key. My goal is to create a monitoring program that shows the number of open sessions, locked records and so on from the systmaster database. It must also retrieve status information from the application database. The monitoring screen consists out of several windows. Now the data shown is always the same, and the program runs in a loop with a sleep command in it. Because I cannot show all the information on the screen, I want to give the user the possibility to change his view. Therefore I need the user interaction in a loop without waiting for it. In other languages such as pascal this is not a problem but how can I solve this problem in Informix 4GL. We have 4GL version 6.04. Hereby I want to thank anyone who wants to help me.