BellMode resource

Controls how wc3270 responds to an 3270 ALARM WCC or an NVT BEL (U+0007) character. The value  causes both the Windows console to beep and the wc3270 window to flash; this is the default behavior. The values  and   cause just the beep and just the window flash respectively. The value causes ALARM WCCs and BEL characters to be ignored.