Subweapon

This value is used to "remember" if the player has the Shrinker or Expander selected when pressing the key 7.

Apparently it was meant to work like a bitfield, with the only value used being 2048 (one shifted right by GROW_WEAPON), otherwise it equals zero.

controls the secondary weapon choice. In Duke(TM) only GROW_WEAPON is supported.

0 if using SHRINKER_WEAPON, 2048 if GROW_WEAPON.