MutExVar Variable

union {
  struct {
    NODE_INFO _hostInfo;
  } group1;
  struct {
    WORD_VAL _tftpBlockNumber;
    WORD_VAL _tftpDuplicateBlock;
    WORD_VAL _tftpBlockLength;
  } group2;
} MutExVar;

Mutually Exclusive variable groups to conserve RAM.