& - starts AND section, where all conditions are joined with AND operator. If any condition is FALSE, checks are stopped and section result is FALSE, unless there is also OR section. | - starts OR section, where all conditions are joined with OR operator. If any condition is TRUE, the whole OR section evaluates to TRUE.
Examples:
Code:
&v1>3/v1<10/v1<>5|v1=999/1000; TRUE if (v1 > 3 and v1 < 10 and v1 <> 5) OR (v1 = 999) OR (flag 1000 is set)