How to find what are the cron jobs which are running at any instant on a Solaris server ??? The job can be scheduled from any id but still would like to list all the cron jobs which are running on the server ???

U can view all crontabs in /var/spool/cron/crontabs/

Process 201 is cron. cron is started in the S75cron file in /etc/rc2.d. The sole purpose of this file is the graceful starting and stopping of cron. It checks for the file /etc/cron.d/FIFO and the process cron in the process table, and if cron is already running, will not execute an additional process. If cron is not running, it executes rm to remove /etc/cron.d/FIFO from the file system in case it exists, and executes a new cron process. Standard arguments apply.

Check to see if the 'cron' daemon is running.
ps -ef | grep cron

There should be a process: /usr/sbin/cron that started at the same time as the system booted (check with who -b).

You can 'bounce' the cron daemon, if you want, with:
/etc/init.d/cron stop
/etc/init.d/cron start