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Xlog handles 3 schemes of sharing information between applications.

1) You can send information from xlog to an application by using shared
	memory. When a callsign is entered into the callsign field of the QSO
	frame, this callsign will be placed into shared memory, so a second
	application can grab it.

	Twpsk, written by Ted Williams (WA0EIR) uses this scheme. The callsign
	will show up in twpsk's send widget (where you type your text) when
	hitting Shift+Alt+h. Shift+Alt+o will show 'hiscall de mycall'.

	See fromxlog.c in the remote directory for an example. You need a
	unique key when setting up shared memory.

2) Information can be send from a second application to xlog using message queues.

	Remote logging is implemented by using message queues. Message queues
	are set up with a call to msgget and using the number 1238 as a key.
	You have to set up a struct for the message queue first. The mtype
	variable of this struct should be set to 88. Total message length
	should not exceed 1024 characters.

	Some examples for messages:
	"program:gmfsk\1version:1\1date:29 Jul 2001\1time:2214\1call:oh2bns"

	Messages send to xlog should consist of fields, separated by the '\1' 
	character. Fields are started with a descriptor, followed by a
	colon (':'). Possible fields are:

	program:<name of program which sends the QSO information>
	version:<version string for the message queue, must be '1' for now>
	date:<date of QSO, preferable 'dd mmm yyyy'>
	time:<start time of QSO, preferably in GMT>
	endtime:<end time of QSO, preferably GMT (mandatory in some countries)>
	call:<callsign of your contact (will be converted to uppercase)>
	mhz:<frequency in MHz>
	mode:<any one of CW,SSB,RTTY,PSK31,etc (will be converted to uppercase)>
	tx:<report (RST) which you have send>
	rx:<report (RST) which you have received>
	name:<name of the operator you have contacted>
	qth:<town of the operator you have contacted>
	notes:<additional notes>
	power:<power you have used (mandatory in some countries)>
	locator:<QRA locator, as used in VHF QSO's>
	free1:<information to put in freefield1>
	free2:<information to put in freefield2>

	Allowed field widths for the log:

	date:15  time:8   endtime:8  call:15    mhz:15     mode:8    tx:15
	rx:15 	 name:30  qth:30     power:8    locator:8  free1:30  free2:30
	The mhz, mode, tx and power fields may contain the HAMLIB token, e.g:
	'mhz:HAMLIB'. This token will let xlog retrieve information from the rig
	and use it for logging.

	If the endtime, name, qth, power, locator, free1 and free2 fields are 
	not in the log,	they will be put in the remarks field (make sure it is
	present), separated by a comma.

	The version string is needed to distinguish between possible future
	changes in the message format. Xlog will display in it's statusbar when
	a remote entry is received, along with the name of the program if it is

	If you leave out date and time, xlog will add them to the log for you,
	this is demonstrated in demo 3 of sendtoxlog.c. If you leave out band
	and mode, xlog will add them for you if the optionmenu is used, or if
	a value is present in the editbox. This is demonstrated in demo 1 and 3.

	You should not remove the message queue, with a call to 
	msgctl(msgid, IPC_RMID, 0), xlog will take care of this.

3) Information can be send from a second application to xlog using sockets.

	Xlog listens on port 7311 for incoming messages. Format of these messages
	is the same as above. See client.c for example code.
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