Example: .IF: #THIS<=THAT
Here is the block
.IF
Block between the two .IF lines is processed if
the numeric value of THIS is less than or equal
to THAT. If the # is omitted, the variables are
compared as strings. Use: =, <, >, <=, >=, <>.
.IF blocks may also be nested, like this:
.IF: THIS<>THAT
Outside block
.IF: OTHER=ANOTHER
Inside block
.IF
.IF