This system occurs during the middle of the night (Oh Dark Thirty as some would have it).  The boys like to go out, but we (my wife and I) don't think it's safe to just turn them loose.  They have gotten into scuffles with both possums and raccoons.  The latter can inflict damage to the little guys, and have done so in the past, so we want to prevent that.  So this system involves leashes in simple loops, to keep us together, and literally is a burst out the door, some quick bladder emptying, and back in.  Not too much investigation, not peeing to mark anything, just a comfort stop on the long journey to morning, when we'll all be ready for the dawn patrol.