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Relational Tests
By default, acedSSGet() selects entities that match all the criteria in the filter list.
The implied relation between each item in filter is "equals."
For numeric groups (integers, reals, points, and vectors) you can specify
other relationships by including a special -4 result buffer that specifies
a relational operator.
The operator applies to the result buffer that immediately follows it.
Relational operators are specified by strings.
The following table shows the possible operators.
Relational operators for selection set filter lists:
Operator Description
"*"  Anything goes (always true)
"="  Equals
"!="  Not equal to
"/="  Not equal to
"<>"  Not equal to
"<"  Less than
"<="  Less than or equal to
">"  Greater than
">="  Greater than or equal to
"&"  Bitwise AND (integer groups only)
"&="  Bitwise masked equals (integer groups only)
The relational operators can be used in any of the following ways, depending on the group you are testing.
All relational operators except for the bitwise operators "&" and "&="
are valid for both real- and integer-valued groups.
The bitwise operators "&" and "&=" are valid only for
integer-valued groups. The result buffer that follows the
bitwise operator must be of type RTSHORT,
which is used as a mask for the integer group.
The bitwise AND "&" is true if the bits set in the mask are set
also in the integer group ((integer_group & mask) != 0). The bitwise masked equals
"&=" is true if the mask is identical to the integer group ((integer-group ^ mask) == 0).
For point groups, the X, Y, and Z tests can be combined into a single string,
with each operator separated by commas--for example, ">,>,*".
If you omit an operator from the string (for example, "=,<>" leaves out the Z test),
the "anything goes" operator "*" is assumed.
Direction vectors (group type 210) can be compared only with the operators
"*", "=", and "!=" (or one of the equivalent "not equals" strings).
You cannot use the relational operators with string groups. Use wild-card tests instead