VSHELL.EXE is the game's menu.
none known, todo: understand the decompiled code mess
vshell.exe dummy -eggplant -X3 -G
dummy: unknown
-eggplant: this is the key for the direct-call switch
-X3: unknown
-G, -E or -F are the language
via ES.EXE:
-s: unknown
-a: unknown
-@: unknown
-SPRUNKNOWN: cheat mode (do not use in quick game, this will crash!!!)
-L: unknown
via code
-V show version
-X
-d or /d: something with the application window size and order (topmost or not)
launch the game engine
out-of-herc gameplay (HERC config, squad config etc)
savegame management
settings management
run demo
show credits