My question maybe too simple to you ,but I really want to get your help. I am turely a new of RTlinux community,I 've read some paper and sample applications on RTlinux home site.I noticed that "RT tasks can not make system calls,so I wonder what and how RT tasks can do besides communicate with linux tasks?especially I/O operation?for example,if I want RT task to process keybord interrupt and get information from keybord,what functions should I use?Do I need to install a RT com driver?If I do,how? I really want to get enough details on I/O operation API of rtlinux. My email address:[EMAIL PROTECTED] thanks to everyone who help me! yours shaowu __________________________________________________ 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/