Type   Name   Summary
 
 Compiler Directive   $I   Allows code in an include file to be incorporated into a Unit
 Compiler Directive   $IfDef   Executes code if a conditional symbol has been defined
 Compiler Directive   $IfNDef   Executes code if a conditional symbol has not been defined
 Compiler Directive   $IfOpt   Tests for the state of a Compiler directive
 Compiler Directive   $Include   Allows code in an include file to be incorporated into a Unit
 Compiler Directive   $IOChecks   When on, an IO operation error throws an exception
 Keyword   If   Starts a conditional expression to determine what to do next
 Keyword   Implementation   Starts the implementation (code) section of a Unit
 Keyword   In   Used to test if a value is a member of a set
 Procedure   Inc   Increment an ordinal variable
 Function   IncDay   Increments a TDateTime variable by + or - number of days
 Function   IncHour   Increments a TDateTime variable by + or - number of hours
 Procedure   Include   Include a value in a set variable
 Function   IncMillisecond   Increments a TDateTime variable by + or - number of milliseconds
 Function   IncMinute   Increments a TDateTime variable by + or - number of minutes
 Function   IncMonth   Increments a TDateTime variable by a number of months
 Function   IncSecond   Increments a TDateTime variable by + or - number of seconds
 Function   IncYear   Increments a TDateTime variable by a number of years
 Directive   Index   Principally defines indexed class data properties
 Constant   Infinity   Floating point value of infinite size
 Keyword   Inherited   Used to call the parent class constructor or destructor method
 Variable   Input   Defines the standard input text file
 Function   InputBox   Display a dialog that asks for user text input, with default
 Function   InputQuery   Display a dialog that asks for user text input
 Procedure   Insert   Insert a string into another string
 Function   Int   The integer part of a floating point number as a float
 Type   Int64   A 64 bit sized integer - the largest in Delphi
 Type   Integer   The basic Integer type
 Keyword   Interface   Used for Unit external definitions, and as a Class skeleton
 Function   IntToHex   Convert an Integer into a hexadecimal string
 Function   IntToStr   Convert an integer into a string
 Function   IOResult   Holds the return code of the last I/O operation
 Keyword   Is   Tests whether an object is a certain class or ascendant
 Function   IsInfinite   Checks whether a floating point number is infinite
 Function   IsLeapYear   Returns true if a given calendar year is a leap year
 Function   IsMultiThread   Returns true if the code is running multiple threads
 Function   IsNaN   Checks to see if a floating point number holds a real number