param.pword[1] = MSG_INT or MSG_VLP
param.pword[2,3] = sender context or node,0
param.pword[4,5] = receiver context or node,0
param.pword[1] = MSG_INT or MSG_VLP
param.pword[2,3] = sender context or node,0
param.pword[4,5] = receiver context or node,0