Glossary - H

 H    

 handle - (1) An identifier that represents an object, such as a device or 
    a window, to the Presentation Interface.   (2) In the Advanced DOS and 
    OS/2 operating systems, a binary value created by the system that 
    identifies a drive, directory, and file so that the file can be found 
    and opened. 

 handshaking - A method by which two pieces of hardware, such as a 
    personal computer and a plotter, can communicate. Depending upon the 
    devices communicating, handshaking occurs either as a hardware 
    function or through software, such as a device driver. 

 hard error - An error condition on a network that requires that the 
    network be reconfigured or that the source of the error be removed 
    before the network can resume reliable operation. 

 hardware palette - The array of RGBs that the physical device is 
    displaying. 

 heap - An area of free storage available for dynamic allocation by an 
    application. Its size varies depending on the storage requirements of 
    the application. 

 hex - See hexadecimal 

 hexadecimal - Pertaining to a system of numbers to the base 16; 
    hexadecimal digits range from 0 through 9 and A through F, where A 
    represents 10 and F represents 15. 

 hook - A point in a system-defined function where an application can 
    supply additional code that the system processes as though it were 
    part of the function. 

 hook chain - A sequence of hook procedures that are "chained" together so 
    that each event is passed in turn to each procedure in the chain.