If omitted, all locks set by this user's LOCK statements during the current login session will be cleared. Perform Commands relating to the 64 semaphores. If omitted and the lock is locked, then the command will sit and wait. NO.WAIT allows the user to tell the command not to wait if the lock is already set by another user. The valid range is from 0to 10, and the default is to use 4.
Truncation takes place as opposed to rounding.
This can be very useful for validating data if only a specific set of characters is permitted, such as the alphabet in uppercase. THEN everything is OK ELSE some erroneous chars exists. OFF specifies that the break key may not be used during the program. If an expression is specified instead of ON or OFF, then if the expression evaluates to false, zero, or null, the break key is inhibited. If the value is true, greater than zero, or not null, the break key is operational.