Tab button:
If comments box is minimized, moves your cursor to the next time entry cell.
If the comments box is maximized, moves your cursor to the Comments field.
If your cursor is in the Comments box field, moves your cursor to the next time entry cell (or to the first task-hours level user defined field, if any exist).

Shift + Tab buttons:
Moves your cursor one time entry cell to the left.

Arrow keys:
If the cursor is in the time entry cell, moves your cursor to the cell above, below, left or right.

Ctrl + F buttons:
Allows user to search all visible fields on the timesheet using the browser's search feature.