Quote:
but for 2.. its //set %variable value


I know /set works, but since the %var = value statement is some sort of macro for /set, I don't see a reason for it not to work.
Try the following and you'll know what I mean:

Code:
//echo -a $(%var = value)


Using double slashes or not has nothing to do with it either, try:

Code:
//var %i | %i = 5 | echo -a %i


This will stop executing when it hits %i = 5, which leads to not producing the /echo.

void main