My question maybe too simple to you,but I really want to get your help. In fact,I am turely a new member of RT-linux community.I 've read some paper and sample applications,I noticed that "realtime tasks can not make system call", I wonder besides communicate with linux tasks,what and how can be done by realtime tasks?Especially I/O operation?for an example,if I want to get keybord input information in RT task,what function should I use?Do I need to install a RT com driver or something else?if I do,how? Thanks to everyone who help me! yours xiaowu __________________________________________________ 欢迎使用首都在线免费电子邮箱http://freemail.263.net --- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] ---- For more information on Real-Time Linux see: http://www.rtlinux.org/~rtlinux/