Any buy command(also say /buy) - opens buy menu if you have credits.
Flashlight button (bind f "impulse 100") - opens backpack menu where items are stored.
Use button(bind e +use) - used on objects - dead bodies, hp stations, for dna scanner etc.
bind x +specialvoice - you can talk only with Detectives or Traitors if you are one.
bind v +ttt_bind1 - usable bind for items.
say /rules and say /help - opens rules/help menu.
say /ttt - opens unified TTT menu with usefull stuff.