EXEC slot - run the program in that slot. END will jump back to the original slot. USE slot - create variables and functions from that slot. COMMON DEF functions can be called directly from the original slot, and you can use VAR() and CALL to access all variables/functions EXEC "PRG_:NAME" - shortcut for LOAD "PRG_:NAME",FALSE:EXEC _ USE "PRG_:NAME" - shortcut for LOAD "PRG_:NAME",FALSE:USE _