Here's an example that I find rather useful from time to time.
You may have seen in the manual that when you multiply two 16bit numbers together, the result is a 32bit number that can then be used with the DIV32 command. But the 32bit multiply result is not available to the user, it's only in PBP system variables where you can't get at it.

This little routine let's you retrieve that 32 bit result.
Code:
A32bitVar       var word[2]
Dummy           var word

ASM
GetMulResult macro Dword
    MOVE?WW    R2, Dword         ; Low Word
    MOVE?WW    R0, Dword + 2   ; High Word
    endm
ENDASM

Dummy = 1000
Dummy = Dummy * Dummy
@ GetMulResult  _A32bitVar

end
The 32 bit result for 1,000,000 is now contained in the two words of A32bitVar.

HTH,
Darrel Taylor