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Across 6. a security system which keeps out unwanted users and viruses 8. Unconditional jump statement 11. Used in patttern matching search (sql) 12. Manual to any software 16. A method of checking for errors without actually running it 18. = Operator 19. A relational algebra operations where all tuples that are common in both relations are taken 20. A person in which goes into other files and acccounts without the permission of the user

Down 1. The no. of times a loop body is executed even if the condition is false in a do-while loop 2. The transmitting and receiving of data 3. Layered Structure(LIFO) 4. In GUI, a small on-screen window with blanks for user input. 5. Not Selected as Primary Key 7. Series of letters and/or numbers specifying the location of a document on the World-Wide Web. 9. The ettiquette that is followed when using a network 10. It restricts the values in rows(sql) 13. Standard arrangement of keys on a UK or US typewriter or computer keyboard. 14. Illegally copying/distributing programs 15. Small file saved on client (a tasty snack) 17. Number of attributes in a relation(sql)