維基百科對handler的解釋：

Handler, an asynchronous callback (computer programming) subroutine in computing ... Event handler, a routine for processing a programming event Interrupt handler, a routine for processing CPU interrupts Signal handler, a routine for handling signals sent to a process Exception handler, a routine for handling software exceptions

維基百科對handle的解釋：

In computer programming, a handle is an abstract reference to a resource. Handles are used when application software references blocks of memory or objects managed by another system, such as a database or an operating system. A resource handle can be an opaque identifier, in which case it is often an integer number (often an array index in an array or "table" that is used to manage that type of resource), or it can be a pointer that allows access to further information.Common resource handles are file descriptors, network sockets, database connections, process identifiers (PIDs), and job IDs. Process IDs and job IDs are explicitly visible integers, while file descriptors and sockets (which are often implemented as a form of file descriptor) are represented as integers, but are typically considered opaque. In traditional implementations, file descriptors are indices into a (per-process) file descriptor table, thence a (system-wide) file table.

總結來說

A handle is an abstract reference to a resource. Handle是對某個資源的抽象引用。 A handler is an asynchronous callback subroutine. Handler則是一個異步的回調函數(子程序)。

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