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| halfdelay Subroutine | Controls input character delay mode. |
| has_colors Subroutine | Color manipulation functions and external variables for color support. |
| has_ic Subroutine | Query functions for terminal insert and delete capability. |
| has_il Subroutine | Query functions for terminal insert and delete capability. |
| hosttoID Subroutine | Accesses the host information in the audit host database. |
| hcreate Subroutine | Manages hash tables. |
| hdestroy Subroutine | Manages hash tables. |
| hsearch Subroutine | Manages hash tables. |
| hypot Subroutine | Computes the Euclidean distance function and complex absolute value. |
| IDtogroup Subroutine | Accesses the group information in the user database. |
| IDtouser Subroutine | Accesses the user information in the user database. |
| IDtohost Subroutine | Accesses the host information in the audit host database. |
| IMAIXMapping Subroutine | Translates a pair of Key and State parameters to a string and returns a pointer to this string. |
| IMAuxCreate Callback Subroutine | Tells the application program to create an auxiliary area. |
| IMAuxDestroy Callback Subroutine | Tells the application to destroy the auxiliary area. |
| IMAuxDraw Callback Subroutine | Tells the application program to draw the auxiliary area. |
| IMAuxHide Callback Subroutine | Tells the application program to hide an auxiliary area. |
| IMBeep Callback Subroutine | Tells the application program to emit a beep sound. |
| IMClose Subroutine | Closes the input method. |
| IMCreate Subroutine | Creates one instance of an IMObject object for a particular input method. |
| IMDestroy Subroutine | Destroys an input method instance. |
| IMFilter Subroutine | Determines if a keyboard event is used by the input method for internal processing. |
| IMFreeKeymap Subroutine | Frees resources allocated by the IMInitializeKeymap subroutine. |
| IMIndicatorDraw Callback Subroutine | Tells the application program to draw the indicator. |
| IMIndicatorHide Callback Subroutine | Tells the application program to hide the indicator. |
| IMInitialize Subroutine | Initializes the input method for a particular language. |
| IMInitializeKeymap Subroutine | Initializes the keymap associated with a specified language. |
| IMIoctl Subroutine | Performs a variety of control or query operations on the input method. |
| IMLookupString Subroutine | Maps a Key/State (key symbol/state) pair to a string. |
| IMProcess Subroutine | Processes keyboard events and language-specific input. |
| IMProcessAuxiliary Subroutine | Notifies the input method of input for an auxiliary area. |
| IMQueryLanguage Subroutine | Checks to see if the specified input method is supported. |
| IMSimpleMapping Subroutine | Translates a pair of KeySymbol and State parameters to a string and returns a pointer to this string. |
| IMTextCursor Callback Subroutine | Asks the application to move the text cursor. |
| IMTextDraw Callback Subroutine | Tells the application program to draw the text string. |
| IMTextHide Callback Subroutine | Tells the application program to hide the text area. |
| IMTextStart Callback Subroutine | Notifies the application program of the length of the pre-editing space. |
| iconv Subroutine | Converts a string of characters in one character code set to another character code set. |
| iconv_close Subroutine | Closes a specified code set converter. |
| iconv_open Subroutine | Opens a character code set converter. |
| idlok Subroutine | Terminal output control subroutines. |
| if_freenameindex Subroutine | Frees memory allocated by if_nameindex. |
| if_indextoname Subroutine | Determines the interface name associated with a particular index. |
| if_nameindex Subroutine | Retrieves index and name information for all interfaces. |
| if_nametoindex Subroutine | Retrieves the interface index associated with a particular interface name. |
| ilogb Subroutine | Computes certain binary floating-point arithmetic functions. |
| imul_dbl Subroutine | Computes absolute value, division, and double precision multiplication of integers. |
| inch Subroutine | Inputs a single-byte character and rendition from a window. |
| incinterval Subroutine | Manipulates the expiration time of interval timers. |
| inet_net_ntop Subroutine | Converts between binary and text address formats. |
| inet_net_pton Subroutine | Converts between text and binary address formats. |
| inet_ntop Subroutine | Converts between binary and text address formats. |
| inet_pton Subroutine | Converts between text and binary address formats. |
| init_color Subroutine | Color manipulation functions and external variables for color support. |
| initgroups Subroutine | Initializes supplementary group ID. |
| initialize Subroutine | Performs printer initialization. |
| init_pair Subroutine | Color manipulation functions and external variables for color support. |
| initscr Subroutine | Initializes curses and its data structures. |
| initstate Subroutine | Generates pseudo-random numbers more efficiently. |
| insch Subroutine | Inserts a single-byte character and rendition in a window. |
| insertln Subroutine | Inserts a blank line above the current line in a window. |
| insque Subroutine | Inserts or removes an element in a queue. |
| intrflush Subroutine | Enables or disables flush on interrupt. |
| invert Subroutine | Multiple-precision integer arithmetic. |
| ioctl Subroutine | Performs control functions associated with open file descriptors. |
| ioctl32 Subroutine | Performs control functions associated with open file descriptors. |
| ioctl32x Subroutine | Performs control functions associated with open file descriptors. |
| ioctlx Subroutine | Performs control functions associated with open file descriptors. |
| is* Subroutine | Classifies characters. |
| isatty Subroutine | Gets the name of a terminal or determines if the device is a terminal. |
| isendwin Subroutine | Determines whether the endwin subroutine was called without any subsequent refresh calls. |
| is_linetouched Subroutine | Window refresh control functions. |
| isnan Subroutine | Determines classifications of floating-point numbers. |
| iswalnum Subroutine | Tests a wide character for membership in a specific character class. |
| iswalpha Subroutine | Tests a wide character for membership in a specific character class. |
| iswcntrl Subroutine | Tests a wide character for membership in a specific character class. |
| is_wctype Subroutine | Determines properties of a wide character. |
| iswctype Subroutine | Determines properties of a wide character. |
| iswdigit Subroutine | Tests a wide character for membership in a specific character class. |
| iswgraph Subroutine | Tests a wide character for membership in a specific character class. |
| is_wintouched Subroutine | Window refresh control functions. |
| iswlower Subroutine | Tests a wide character for membership in a specific character class. |
| iswprint Subroutine | Tests a wide character for membership in a specific character class. |
| iswpunct Subroutine | Tests a wide character for membership in a specific character class. |
| iswspace Subroutine | Tests a wide character for membership in a specific character class. |
| iswupper Subroutine | Tests a wide character for membership in a specific character class. |
| iswxdigit Subroutine | Tests a wide character for membership in a specific character class. |
| itom Subroutine | Multiple-precision integer arithmetic. |
| itrunc Subroutine | Rounds floating-point numbers to signed integers. |
| j0 Subroutine (bessel) | Computes Bessel functions. |
| j1 Subroutine (bessel) | Computes Bessel functions. |
| jn Subroutine (bessel) | Computes Bessel functions. |
| jcode Subroutine | Perform string conversion on 8-bit processing codes. |
| jrand48 Subroutine | Generate uniformly distributed pseudo-random number sequences. |
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