char atpSocket; 1 0 Currbitmap for requests or ATP
socket number
char atpFlags ; 1 1 Control information
AddrBlock addrBlock; 4 2 Source/dest. socket address short reqLength; 2 6 Request/response length
Ptr reqPointer; 4 8 Ptr to request/response data Ptr bdsPointer; 4 12 Ptr to response BDS