Optickle is a general model for the electro-opto-mechanical part of a GW detector. It ventures into mechanics only as far as is necessary to include radiation pressure effects, and into electronics only far enough to produce demodulation signals, and into optics only up to first order. There are many other tools that do all these things in greater detail. Optickle is for quick, rough, but essentially complete design studies. In Optickle you can, in principle, simulate any interferometer. The provided example is a Fabry-Perot cavity, optFP. There is currently only one demo file which you are encouraged to run and read: demoDetuneFP. Alignment sensing and control demos are lacking, so for now just read the help on tickle01. >> cd Optickle >> >> >> path(pathdef) >> addpath(genpath(pwd)) >> >> demoDetuneFP There is much more to say, but for now look at the demo, and use the help command! If things get bad, you can always send me email. I like questions from people who actually use my code. At least the first few questions. -Matt mevans@ligo.mit.edu