How do I end a level?

[Altered Reality]

I almost finished the level I'm making, and I said almost because I don't know how to proceed for the last and final thing: the end of the level. I suppose it must be triggered, so I need to put a trigger_once where I want my level to end... but what does this trigger have to do? Call a script function? (which contains... what?) Target something? (what?)
EDIT: I found the answer to the question above. A trigger_once must target a target_endlevel.

And what's the difference between loading the next level and returning to the main menu? If I want to load another level I insert the level name as the value for the key "nextMap", but what if I want to return to the main menu?

Oh, and another thing. I want the name of the level to show up in the loading screen, how do I do that?

[Neurological]

Don't know hw to return to mainmenu, but I know how to show the map name. Here the explanation:

You have to create a maps.def on the def folder of your mod, and enter the info of the map in there, for example:

mapDef yourmap_path {
	"name"		"#str_xxxxx" 
	"devname"            "devmapname" 
	"singleplayer"	"1"
	"size0"		"0"
	"size1"		"0"
	"size2"		"0"
	"size3"		"0"
	"snd_loadmusic"	"yoursound"
	}

"yourmap_path" if your map is simply on the Maps folder just write the name of the map without the extension, for example: shrapnelcity.

on the "name" line you can add a string calling the name or you can just write the name you want without the "#".

On "devname" you can put the name you want for load the map by console

"snd_loadmusic" play a sound during the level loading, is referred to a sound shader, if you don't want to load a sound just delete the line.

the "size 0,1,2,3" are for the progress loading bar, just put the size of your maps in bytes, or you can leave these to 0.

[Altered Reality]

Thanks, it may come in handy for the next episodes, but it has some issues:
1) when I load a level which is specified in the maps.def file, the loading bar always remains empty
2) when I load a level which is NOT specified in the maps.def file, Prey CRASHES!

By the way, it turned out I didn't really need to know how to return to the main menu: I just ended the level the standard way (=triggering the load of the eventual next level), and if a level of that name does not exist, the game will return to the main menu. If I use the name I plan to use for the next episode, I'll have nothing to change when I release the next episode, and people will be able to play one episode after another without loading each map separately.

[Neurological]

1) try to put the file size on the def. Run prey, open your mod and type this command in the console:

com_updateLoadSize 1

Then run your map, the maps.def should update itself.

2)Don't know why this happen, maybe after creating the def, the game demand it for others maps.