The row and column position in the AT clause of this OPEN WINDOW statement points off the physical screen. The statement is not executed. Review the program, and check that the numbers are in the correct order (first row, then column). The dimensions of the terminal are determined when the program starts by reading termcap information (or terminfo information, depending on the value of the INFORMIXTERM environment variable), so a window origin that is correct for some users might not be correct for all.