Wad (console command)
From OdaWiki
wad
Loads a wad file at runtime, can also load optional dehacked and bex patch(es) along side it.
IWAD files such as doom2.wad can have .wad omitted, but pwads (eg hr2final.wad) must have them, same with patch files.
Loads doom2.wad
wad doom2
Load the pwad hr2final.wad (this wad requires doom2 btw)
wad hr2final.wad
Load both doom2.wad and hr2final.wad
wad doom2 hr2final.wad
Load strain.wad and its shipped patch file
wad strain.wad strain.deh
Load doom2, with strain.wad and strain.deh
wad doom2 strain.wad strain.deh