from v$session

Code:
ROW_WAIT_OBJ# 
 NUMBER 
 Object ID for the table containing the ROWID specified 
 in ROW_WAIT_ROW# 
 
ROW_WAIT_FILE#  NUMBER 
 Identifier for the datafile containing the ROWID 
 specified in ROW_WAIT_ROW#. This column is valid only 
 if the session is currently waiting for another
 transaction to commit and the value of ROW_WAIT_OBJ# 
 is not -1 
 
ROW_WAIT_BLOCK#  NUMBER 
 Identifier for the block containing the ROWID specified 
 in ROW_WAIT_ROW#. This column is valid only if the session
 is currently waiting for another transaction to commit and 
 the value of ROW_WAIT_OBJ# is not -1 
 
ROW_WAIT_ROW#  NUMBER 
 The current ROWID being locked. This column is valid only 
 if the session is currently waiting for another 
 transaction to commit and the value of ROW_WAIT_OBJ# 
 is not -1
Sam