I want to know whats the use(purpose) to set  the flags in the command AliasEdit.In the Shell command we have to set the flags one from 0-15.What is that??Please reply.

This is a bit coded value - see the tip:
http://www.cadforum.cz/cadforum_en/what-is-the-flag-0-15-in-the-command-alias-editor-tip7051