Find references to a certain range of values.
arg1 Start of the range (will be included in the results when found).
[arg2] End of range (will be included in the results when found). When not specified the first argument will be used.
[arg3] Address of/inside a memory page to look in. When not specified CIP will be used.
[arg4] The size of the data to search in.
$result variable is set to the number of references found.