The most frequently used data entry windows allow both the Tab key (standard Windows convention) and the Enter key to move from field to field. The Enter key can be used in the following applications:

Tabs3 Billing Client, Contact, Fee, Cost, Payment, Client Funds
AP Vendor, Invoice
GL None
Trust Trust Account, Trust Transaction
Tabs3 Billing Remote Fee, Cost
System Configuration None
PracticeMaster All Data Entry Windows

All other programs use the Tab key only to move from field to field.