Where we can run two programs in unix console at the same time?

Describe the advantages of having a seperate queue for Print I/O and for Disk I/O?

In win server 2008, 25 computers connected to your domain, how can I see which user is logging & logout details or how many users are active, or I created one OU, how many members are logging, or logout, I want to give daily report.

Is there any differences between HP-UX and AIX in scripting level. Any suggestions?

A) abort process immediately without further ado
B) Perform minor house keeping prior to resumption
C) Roll back process state to last checkpoint
D) Tidy up to process abortion
A) 1&2 B) 2 & 4 C) 3 D) 4

A computer has 3GB of RAM of which the OS occupies 512MB. The processes are all 64 MB (for simplicity) and have the same characteristics. If the goal is 99%CPU utilization, what is the maximum I/O wait that can be tolerated?

By using image tool only we are able to install the OS for multiple machines. Is there any other options available to install the OS for multiple machines at a same time??