Two environments for comparison: TCC 10.00.76 Windows Vista [Version 6.0.6001] TCC Build 76 Windows Vista Build 6001 Service Pack 1 TCC 9.02.155 Windows Vista [Version 6.0.6001] TCC Build 155 Windows Vista Build 6001 Service Pack 1 Under TCMD 10 in an attached TCC or CMD console, if I run a continuous ping (e.g., ping -t x.x.x.x) or a simple btm file consisting of the single command "delay 999", ctrl/c will interrupt neither. Nothing is displayed when ctrl/c is pressed. However, shift/ctrl/c will interupt both the ping and the btm file as expected. But, if the TCC or CMD consoles are detached, then ctrl/c works as expected. Under TCMD 9, ctrl/c works as expected in both attached and detached consoles. I only experience this problem in Vista SP1. I have only one Vista installation, so I don't know if this problem is machine specific. However, this problem does not occur under Windows 7 RTM or XP SP2.