how to remember who is logged in?

im building a web application using coldfusion where the usual login comes first then the viewing / editing of data...
now depending on who's logged in, only specific fields (or columns [since im displaying table contents]) can be modified.
for example, if:
UserA is logged in.
UserA can only modify the Job Grade field

UserB is logged in
UserB can only modify Salary field

others (who successfully loggedin)
can only view data [no editing]

any solution?

u can give javascript if its not possible with coldfusion.
just hope u comment it coz im just a newbie to it
but i got a moderate knowledge on vb and other dos programming like pascal, (little c/c++) so id probably get the logic.

thanks a lot!

You can keep track of who's logged in via session variables. You mentioned "coldfusion." I don't know much about coldfusion, but I do know that it is server side. Why not keep track of users/passwords and user rights in a Database?

User logges in,
check password from DB
check user rights from DB
keep track of user via session variables.

thanks goodz!
but im new to session variables when it comes to webprogramming... although in regular vb programming its easier but in the web, changes page after page...
can u please, please spare more of ur time teaching me basics on that session variables? i know wat u mean, i just dont know how to do it in the web...

thanks a lot

:)