From a document written by Duncan for the 2001 paper handbook.
Read this. It is important.
You may think that you know how to wipe your own arse, and that you do not therefore need any advice on how to move your bowels on the Loser Plateau. However, following a number of rather unfortunate stool placements in previous years, and the need for Expo to retain its current good relations with the Austrian National Park authorities, the need for some guidelines as to where to have a shit has become apparent. I think a DOs and DON'Ts format is probably best – hopefully much of this will be very obvious to most people.
DON'T bare your arse anywhere within sight of any tourist paths, for example the one which runs through the old Top Camp. The reason for this should be obvious.
DO make sure that you drop your turds down a reasonably deep hole (preferably deep enough that the turds can't be seen from the surface). This makes it less likely that anyone will discover your clutch of eggs, and helps to keep the smell down.
DON'T be tempted to shit in the vicinity of a bivvy site, even if it's minging it down with rain. On a hot day the smell will be keen, and disease rife.
DO take good aim! The best spots (i.e. relatively comfy, not to far away, and good'n'deep) will be discovered and used by several people. No-one wants to see or smell yesterday's slop streaked down the side of an otherwise good grike.
DO think about where your offerings may be washed during a rain-storm – into Steinbrückenhöhle perhaps?
Also, it should be pointed out that if you choose to use bog roll (as most of us do, although more enterprising expo members have experimented with moss, bunde, and limestone), you should set light to each sheet before you drop it down the grike; there is a cigarette lighter kept with the bog rolls. DON'T drop the lighter down the grike.
Over the last few years a certain grike in thick bushes close to the stone bridge has become canonical. Hence the importance of good aim is redoubled. This now has a loo seat as pictured.
Postscript: We have a not-too-serious set of diagrams on how to achieve correct aim.