please advise on mysql memory,users monitoring

First of all, thanks for the mailing list for giving details about myisamchk.we used them but we got some errors which I have reported in 'myisamchk errors' mail to mysql. At present we are working in mysql 3.23.32 ,windows xp os. Are there any system tables that store mysql related info.(like

mysql memory,users monitoring

First of all, thanks for the mailing list for giving details about myisamchk.we used them but we got some errors which I have reported in 'myisamchk errors' mail to mysql. At present we are working in mysql 3.23.32 ,windows xp os. Are there any system tables that store mysql related info.(like

mysql memory,users monitoring

First of all, thanks for the mailing list for giving details about myisamchk. At present we are working in mysql 3.23.32 ,windows xp os. Are there any system tables that store mysql related info.(like memory related issues etc). Are there any other ways to find memory used and free memory