https://kcmlref.com/kcmlrefman/BYREF.htm
BYREF | KCML Reference Manual
General Form: 'func(BYREF arg) ... DEFSUB 'func([ CONST] BYREF arg) ... END SUB
reference manualkcml
https://kcmlref.com/kcmlrefman/KCML_RETURNSTACK_ENUM.htm
Types of return stack entry | KCML Reference Manual
reference manualtypesreturnstackentry