save changes to the donor record without exiting the dialog box chacking an u201c okay u201d button 230 saves changes to the donor record and exits the dialog box similarly at any time while using the donor entry dialog box 221 the operator may click the cancel button 228 to cancel the current entry session the assembly 140 may then prompt the operator to confirm the cancellation if cancellation is confirmed the system may lose all unsaved changes and closes the donor entry dialog box 221 a help button 227 is preferably also provided to present a corresponding help screen not shown when desired fig3 a shows the next step in the collection procedure after donor check in is completed the display screen 301 shows the donors who have been checked into the system and are now ready for selection of the desired collection procedures the work area 202 of screen 301 in fig3 a displays a listing of donors who have been checked in a donor may be selected by clicking the corresponding icon 302 or 303 for example once the donor is selected in screen 301 the next step can be accessed by clicking the u201c prepare u201d button 304 in the main work area 202 or by again.