In short no. There is no equivalent to INT. Taskmanager > KILL only.
Best thing to do is try to work out if it's always at the same point where you have the problem. Can you recreate it? Have you tried a later SP or release? R10SP9 and R12SP2 are available.
What UNIX are you using? If it's SUN Solaris then there's SUNForum which is a free Netmeeting type app (compatible with NM too). Alternatively if it's not Solaris you might get some milage with RealVNC but I'm not sure it will support the graphics required by V4. Other applications like...