If I log on to MSN Messenger, but I don't want a particular one to know that I'm online,?
912866
Right click with mouse on the name of the person you dont want him to see you on line and chose block.  But if your freind is internet professional, i must warn you. There is a  Msn site which shows who is blocked or deleted from others msn messanger.. Isnt that imbaressing :-))))
392851
check your status...it might be set appear offline
545822
someone is coming online in ur yahoo messenger \nor in icQ
437729
press cntl+alt+del and turn of msn messenger\nthen click on the messenger icon and start it again\nwhile it says logging in click cancel\nenter ur id and password and login
1110450
It appears you are being spammed thru messenger, this is NOT MSN Messenger but a service of Windows.  Turn it off, it is a security risk.  control panel - Administrative tools - services and then disable messenger.  It will not stop any instant messenger program.  Otherwise you are referring to a pop up from you browser in which you need to get a pop up blocker\n\nThat should be worth 10 points!!
470006
If you mean is there a database or the info stored somewhere that would tell you that, then no.\n\nYou can add the person's ID to your messenger & watch to see when s/he comes & goes offline.
941871
nope they wont at all, but if you have the new Windows Live Messenger you can always talk to people while your status is offline and they cant see that your online.
507484
Pfft, nevermind what the guy before me said. Click Start -> Run -> type msconfig -> click the last tab, labled startup, then uncheck msn messenger, and check Yahoo! Messenger...\n\n\nregards, \n\n\nJames
713189
For AIM, go to My AIM|Edit Options|Edit Preferences. From there, click on Sign On/Sign Off under Categories. There should be a check box that reads "Start AIM When Windows Starts." I don't know how to disable that feature on MSN Messenger, but I would assume that they have a similar properties option. I would check through the options on the toolbar.
329419
If they signed in as invisible, they will look off line to you, or anyone they choose. I dont think there is any way you can find out otherwise
1097178
when u sign in for the first time ( when u put your id and pass ) to do log off and log on manually that will give you the option deselect log in authomaticly that will stop from getting your messenger go online :D
350204
Idk......but sometimes the msn thing signs in when u turn the computer on and they don't want to get on so they sign off
145028
there are some chat services that offer this service such as www.icq.com.u may check out the ignore private message option in yahoo,msn services..
575738
Click on Messenger , Preferences and then Alerts and Sounds. Disable All Alerts that you dont want , inculding the ones on Start Up. \n\nHope this helps
950617
Make yourself look unavailable..or put up the busy signal on  your msn if you are only able to talk to one person at a time, that way if they message you then you can ignore them but it wont look like you are because  your icon says busy. There is nothign rude with that..and if you want to speak to someone else just tell the other person you have to go and they will not be able to tell if you are online or not.
260897
You can't delete your id from a friend's computer, but you can make yourself 'invisible' to that particular person when you sign into messenger. In that way, they think you're not online and won't IM you.
227068
The only possible way has been answered. You have to appear invisible to all. \n\nBut then again, if the person who's trying to track you down wants to really track you, he can use "Buddy finders" which tells any one if any buddy is online EVEN IF THEY ARE INVISIBLE. !\n\nso, there is actually no way.\n\nif you don't wish to receive IM's from people who are not on your list, then you can change your preferences to receive im's only from buddies on the buddy list. !