lucky me owns a Tektronix TDS540 oscilloscope (4 channels, 500MHz BW, 1 GS/s) without floppy drive and BW monitor.
Here's an easy way to create colored .png files from the TDS540 (and probably other TDS series CRO) :
connect the TDS to your PC via RS232
in the Hardcopy Menu set the printer to "EPS Color Encapsulated Postscript color plot"
* bluestep - locks your screen once you step out of the room,
* provided that you took your bluetooth enabled
* mobile phone with you.
* version 0.01
* usage: bluestep <bdaddr>
* bdaddr - MAC address of the remote bluetooth device
* (c) 2005 by Matthias Wenzel, licensed under GPLv2
this tiny daemon peridically pings your bluetooth mobile, if doesn't get responses for a while it will lock your X desktop with "xscreensaver-command -lock".
# l2ping -c 3 00:11:22:33:44:55
Ping: 00:11:22:33:44:55 from 00:55:44:33:22:11 (data size 44) ...
0 bytes from 00:11:22:33:44:55 id 0 time 27.52ms
0 bytes from 00:11:22:33:44:55 id 1 time 32.05ms
0 bytes from 00:11:22:33:44:55 id 2 time 47.04ms
3 sent, 3 received, 0% loss
if the above command works you're probably set to run bluestep!