> > "Or, you could break the glass ...". >Exactly why I thought of using the pressure inside. > >Cheers, >-Neil. The problem with internal pressure is that it will lag behind the actual quite a bit. The "in case of emergency break glass" is done on the bigger machines but only as a last resort as it produces a lot of errors. Mind you if you have wondered into a cloud/storm and had your static ports ice over anything at this stage is better than nothing. Dave -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body