lastobject - last used object
lasttarget - last target object
backpack - your backpack or character's backpack
lastcontainer - last container opened by server for your character
laststatus - object by last status, you get it if you use getstatus, client's target next or just drag status bar
lastattack - last object what you have attacked
lastequip - last object which was moved by commands: equip, equipt, unequip
lasthorse - last object what you have used for ride. (used meands dlb-click, it's not the same as just riding, you must realy use it for injection to remember)
lastcorpse - last corpse what have apeared in front of your monitor (NOT last opened corpse)
finditem - last found object
self - yourself aka character
lasttargetkey

Be more specific. What do you want to "solve" or do...