The following HLLAPI functions are supported. A brief description of the purpose and result of the function follows each entry. Note that almost all of these functions can only be issued if connected to a host. For important additional information please see the winhlapi.hlp file included in the samples directory.

#	NAME	Description
1	ConnectPresentationSpace	Establishes a connection between a presentation space in a host session connection and your windows HLLAPI application
2	DisconnectPresentationSpace	Disconnects a host session presentation space from a WinHLLAPI application
3	SendKey	Send from 1 to 255 keystrokes to the connected host session, and makes the keystrokes appear to be entered from the keyboard by a user on the host
4	Wait	Senses if the host is in a wait state, and if it is, waits the period of time specified in function 9
5	CopyPresentationSpace	Copy the contents of the current host session’s presentation space into a string buffer
6	SearchPresentationSpace	Search the current session host presentation space for a specific string. It returns a true (found) or false (not found).
7	QueryCursorLocation	Determine the location of the cursor in the host presentation space.
8	CopyPresentationSpaceToString	Copy all or part of the host presentation space to a string
9	SessionSetParameters	Set the options of the host session, and anything not set here uses the defaults. Options set here can only be cancelled by function 9 being re-issued or function 21 (reset system) is called.
10	QuerySessions	Returns the number of host sessions that are active, and returns a string value from each connection. Host printer sessions are not supported.
11	Reserve	Lock the user out and prevents keyboard input by reserving the current host session presentation space.
12	Release	Undoes the lockout imposed by the Reserve function, and allows keyboard input into the host session presentation space
13	CopyOIA	Returns the contents of the host session Operator Information Area (OIA)
14	QueryFieldAttribute	Returns the attribute byte of the field contained in the specified position in the host session presentation space
15	CopyStringToPresentationSpace	Copy an ASCII string from the PC to a specified position in the host session presentation space
18	Pause	Causes your application to wait for a specified time
20	QuerySystem	Determines the version of WHLLAPI under which your application is running
21	ResetSystem	Reset WHLLAPI to its default start state. All session options are reset to their defaults. Event notification is stopped. Any reserved sessions are released. Connected sessions are disconnected. The current status of host sessions is updated
22	QuerySessionStatus	Returns the status of a specified session
23	StartHostNotification	Initiates monitoring that notifies your application of changes in the host session presentation space or the Operator Information Area (OIA).
24	QueryHostUpdate	Follows up on function 23 and determines if the host session presentation space or OIA have changed since function 23 was issued, or this was issued
25	StopHostNotification	Cancels functions 23 and 24, and stops the notification of changes in the presentation space and the OIA
30	SearchField	Search a field in the host session presentation space for a specified string. This can be in either a protected or unprotected field, but only in a field-formatted presentation space
31	FindFieldPosition	Determine the starting position of a field in the host session presentation space
32	FindFieldLength	Determine the length of a field in the host session presentation space
33	CopyStringToField	Copy a string into a specified field in the host session presentation space
34	CopyFieldToString	Copy the contents of a specified field in the host session presentation space to a string
40	SetCursorPosition	Place the cursor at a specified location in the host session presentation space
41	StartCloseIntercept	Allows the application to intercept and prevent user requests to close the emulation program
42	QueryCloseIntercept	Determines if user is attempting to close the emulator application
43	StopCloseIntercept	Stops the interception and prevents users from issuing requests to close the emulation program
50	Start Keystroke Intercept	Enables your application to intercept keystrokes sent to a session by a user. Once called, the keystrokes can be received with the get key (function 51) and sent to the same session or another session with the send key (function 3). The keystrokes can be accepted or rejected by Post Intercept Status (function 52). They can be replaced with the send key, or used in a specific manner that suits your application
51	GetKey	Allows your application to receive the keystrokes that were intercepted by function 50, and to process them
52	PostInterceptStatus	Notifies WinHLLAPI that a keystroke obtained with the Get Key function 51 is either accepted or rejected. If rejected a beep sounds
53	StopKeystrokeIntercept	Disable the ability of your application to intercept keystrokes
90	SendFile	Transfers a file from the PC running the WinHLLAPI application to the host
91	ReceiveFile	Transfers a file from the host to the PC running the WinHLLAPI application
99	ConvertPosition/RowCol	Converts a host session presentation space into row and column values for the PC display, or it converts PC display’s row and column values into a host session presentation space position
101	ConnectWindowServices	Allows your application to manage the host session presentation space window. Only one application at a time can be connected to perform This, but more than one host session presentation space window can be managed concurrently
102	DisconnectWindowServices	Stops the functionality initiated by function 101, in that the application cannot use window services to manage a host session presentation space window
103	QueryWindowCoordinates	Requests the window co-ordinates for a host session presentation space
104	WindowStatus	Allows the application to query or change a host session presentation space window’s size, location, or visible state
105	ChangePSWindowName	Allows the application to specify a new name for the host session presentation space window, or reset the name to its default

Extensions for the Windows Environment

WinHLLAPICleanup	The application calls the WinHLLAPICleanup() function to deregister a WinHLLAPI application from a WinHLLAPI implementation. This could be used, for example, to free up resources allocated to a specific application
WinHLLAPIStartup	This allows an application to specify the version of WinHLLAPI required, and to retrieve details of a specific WinHLLAPI implementation. This MUST be called by a WinHLLAPI application before it registers itself with the specific WinHLLAPI implementation that it queries
WinHLLAPIAsync	This function provides an asynchronous flavor to the following HLLAPI functions: STARTKSINTERCEPT, WAIT, STARTHOSTNOTIFICATION, STARTCLOSEINTERCEPT, SENDFILE, and RECEIVEFILE. You should use WinHLLAPIAsync( ) instead of the blocking versions of these functions
WinHLLAPICancelAsyncRequest	This function cancels an outstanding WinHLLAPIAsync( )-based request
WinHLLAPIIsBlocking	This function allows a task to determine if it is executing while waiting for a previous blocking call to complete
WinHLLAPICancelBlockingCall	This function cancels any outstanding blocking operation for its thread. Any outstanding blocked call canceled will cause an error code of WHLLCANCEL to be generated. Examples of blocking calls are WinHLLAPI with function number set to GETKEY, WAIT, PAUSE, SENDFILE or RECEIVEFILE. You should use WinHLLAPIAsync( ) instead of the blocking versions of these functions
WinHLLAPISetBlockingHook	This function installs a new function which a Windows HLLAPI Implementation should use to implement blocking HLLAPI function calls
WinHLLAPIUnhookBlockingHook	This function removes any previous blocking hook that has been installed and reinstalls the default blocking mechanism

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