using DSP BIOS in SIMULINK

hi every one
i am using simulink to burn models on dsp kit
now the problem i am facing is to schedule my tasks(i-e different function
in simulink model).... although there is a DSP BIOS block set provided in
MATLAB SIMULINK but i am not sure how to use it????
i-e how to schedule different tasks using these blocks
if any one can help me in this regard i shall be extremely grateful
kindly reply ASAP?