Updating Date In A Query & Data Access Page

I am trying to do an auto time stamp in a data access page without having to go to new record. What I am doing is farming out parts of a record to different departments, and I want to time stamp each time each department performs their query, but I want to be able to display the data for the department, and store the timestamp in the original table.

Everything is stored under the table [Appointments] and different departments enter certain things. For instance, Reception gives the customer a ticket # which they enter into the database based on the query for the customer appointment. On the data-access page, I want them to be able to see their check in time. I am able to do this with an expression, but I can't store it in the field. Here's what I have:

Expr1:Now() (this is in the query)

In the data access page I display Expr1 with no problem. How do I get the field [Reception time stamp] to equal Expr1? When I try to do it in the query, it treats it as another expression and doesn't store it in the field (Reception time stamp = Expr1)

Is there a way to assign a field the value of an expression in queries or data access pages?

In other words, for the field I have named "Reception Time Stamp" is their anyway to plug in the Now() value when I do my query? Not search for Now() but have it show Now() when I use the query in a data access page without having to create new record. I know how to do it when you time stamp it with new record, but how can I do it with a query that pulls up an existing record that more info is being updated on it.

Table Demographics:
Account Number (Primary)
Name
Address
SSN
DOB

Table Appointments:
Appointment Number (Primary Autonumber)
Appointment Date
Appointment Time
Account Number (Relationship tied to Demographics)
Reception Ticket #
Reception Timestamp
Cashier Amount Collected
Cashier Timestamp

Relationship is One to Many (One Demographic to Many Appointments)

Everybody will be entering data on a data access page using internet explorer, which makes this more tricky, as it would be easy to do using forms. So here's how it works. Appointments enters customer information, appt date, appt time, and account number.

Reception pulls up by date and name(queries) the appointment, and then enters a ticket number (Like taking a number to be waited upon) After they enter this and write this ticket number, I want an auto-time stamp to be saved under the appointment table for reception time stamp.

Then, when their number gets called, the cashier pulls up the patient by ticket number(queries) and collects money from the customer. After they write the amount they collected, I need an auto-time stamp.

The reason I need to auto time stamp is so I can calculate time difference from the customer walking in the door and going out the door. The main reason this has proven difficult is because I am doing all data entry on data access pages, and everybody will be using internet explorer. Another reason is because almost all info is being saved under appointments, and each department only enters a couple of things towards completing the appointment record.