Here is a list of all files with brief descriptions:

ab_accountqueue.h
ab_accountqueuefns.h
ab_jobqueue.h
ab_queue.h
ab_queuefns.h
ab_userqueue.h
ab_userqueuefns.h
abgui.h
aqbanking/account.h
aqebics/account.h
aqhbci/account.h
aqofxconnect/account.h
account_be.h
accountstatus.hpp
accstatus.h
apidoc.h
aqbankingppdecl.hpp
aqebics.h
aqhbci.h
aqofxconnect.h
balance.h
balance.hpp
bankinfo.h
bankinfoplugin.h
bankinfoplugin_be.h
bankinfoservice.h
banking.h	The main interface of the aqbanking library
banking_be.h	This file is used by provider backends
banking_cfg.h
banking_imex.h
banking_info.h
banking_ob.h
banking_simple.h
banking_virt.h
cellphoneproduct.h
country.h
cxxwrap.hpp
dlg_editaccount.h
dlg_edituser.h
dlg_getinst.h
dlg_importer.h
dlg_newaccount_be.h
dlg_newuser_be.h
dlg_selectbackend.h
dlg_selectbankinfo.h
dlg_setup.h
dlg_setup_newuser.h
dlg_usertype_page_be.h
error.h
eu.h
eutransferinfo.h
httpsession.h
imexporter.h
imexporter_be.h	This file is used by provider/importer/exporter plugins
job.h
job_be.h	This file is used by provider backends
jobcreatedatedtransfer.h
jobcreatedatedtransfer_be.h
jobcreatesto.h
jobcreatesto_be.h
jobdeletedatedtransfer.h
jobdeletedatedtransfer_be.h
jobdeletesto.h
jobdeletesto_be.h
jobeutransfer.h
jobeutransfer_be.h
jobgetbalance.h
jobgetbalance_be.h
jobgetdatedtransfers.h
jobgetdatedtransfers_be.h
jobgetstandingorders.h
jobgetstandingorders_be.h
jobgettransactions.h
jobgettransactions_be.h
jobinternaltransfer.h
jobinternaltransfer_be.h
jobloadcellphone.h
jobloadcellphone_be.h
jobmodifydatedtransfer.h
jobmodifydatedtransfer_be.h
jobmodifysto.h
jobmodifysto_be.h
jobsepacreatesto.h
jobsepadebitnote.h
jobsepadebitnote_be.h
jobsepadeletesto.h
jobsepaflashdebitnote.h
jobsepagetstandingorders.h
jobsepamodifysto.h
jobsepatransfer.h
jobsepatransfer_be.h
jobsingledebitnote.h
jobsingledebitnote_be.h
jobsingletransfer.h
jobsingletransfer_be.h
keys.h
listdoc.h
message.h
msg.h
aqbanking/msgengine.h
aqhbci/msgengine.h
ofxhome.h
oh_institute_data.h
oh_institute_data_fns.h
oh_institute_spec.h
oh_institute_spec_fns.h
aqbanking/provider.h	This file is used by AqBanking and provider backends
aqebics/provider.h
aqhbci/provider.h
aqofxconnect/provider.h
provider_be.h	This file is used by provider backends
security.h
stringlist.hpp
system.h
tanmethod.h
textkeydescr.h
time.hpp
transaction.h
transactionfns.h
transactionlimits.h
tutorials.h
aqbanking/user.h
aqebics/user.h
aqhbci/user.h
aqofxconnect/user.h
userfns.h
value.h
value.hpp
aqbanking/version.h
aqhbci/version.h
xml.h
zip.h