A higher order message (HOM) in a computer programming language is a form of higher-order programming that allows messages that have other messages as arguments. The concept was introduced at MacHack 2003[1][2] by Marcel Weiher and presented in a more complete form in 2005 by Marcel Weiher and Stéphane Ducasse.[3] Loops can be written without naming the collections looped over, higher order messages can be viewed as a form of point-free or tacit programming. wikipedia 
Higher Order Messaging (HOM)
by Marcel Weiher www.metaobject.com pdf
In ordinary Smalltalk code, without using HOM, obtaining a collection of the employees that have a salary of 1000 would be achieved with the following code:
salaried := employees select: [ :each | each hasSalary: 1000 ]
However, using HOM, it can be expressed as follows:
salaried := employees select hasSalary: 1000.
Here, select is a higher order message, and hasSalary: is understood to be called on the select message itself, rather than on its result. The Smalltalk language was not modified to implement this feature. Instead, select returns a message that reifies the select send, which then interprets the hasSalary: message.
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> Another example is the use of Future Message sends in the Croquet Project:[4] wikipedia
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