RDP Windows 98 Client

Has anyone discovered a way to automate the Remote Desktop login process on a Win98 platform?

I manage a network in a K-12 school environment and if I can automate the login, I can add a few minutes to the available instruction time during a class period.

The 5.2 RDP client has a checkbox for saving the password but it's greyed out.

I've tried copying the Default.rdp file from a win2k and XP client and running it on the W98 machine but to no avail.
I've spent hours searching the net for solutions...
Any help is appreciated.

Thanks,

MH