Prologue (QMOS) is started with the command B:0,8
Where the 0 stands for Drive 0; if you put in B:1,8 it boots from Drive 1.
The second number must be the boottrack or bootsector.
The G: Command is for direct jumping to a address in memory e.g. G:0100
The T: command is unknown to me.
All questions about how to use KryoFlux go here.