specific terms and conditions. The submitted tender is binding on the tenderer to whom the  contract is awarded for the duration of the contract.  Contacts between the contracting authority and tenderers are prohibited throughout the  procedure save in exceptional circumstances and under the following conditions only:  Upon request, the contracting authority may provide additional information solely for the  purpose of clarifying the procurement documents.  Any request for additional information must be made in writing only through the above TED  eTendering website in the "Questions & answers" tab, by clicking "Create a question"  (registration on TED eTendering is required to be able to create and submit a question).  The contracting authority is not bound to reply to requests for additional information received  less than six working 7 days before the time-limit for receipt of tenders.  Please note the  Question and Answer deadlines at the TED e-tendering link above.  The contracting authority may, on its own initiative, inform interested parties of any error,  inaccuracy, omission or any other type of clerical error in the text of the procurement  documents.  Any additional information will be published on the above TED eTendering website. The  website will be updated regularly and it is the economic operator's responsibility to check for  updates and modifications during the submission period$^{1}$. Tenders will be opened electronically on the date and time indicated under Heading IV.2.7 of  the contract notice. Tenderers may attend the opening session remotely via the Skype for  Business application (maximum two representatives per tender). For organisational and  security reasons the tenderer must send to env-tenders@ec.europa.eu at least twenty-four  hours before the scheduled start of the opening session, the full name and e-mail address of  the representative(s) together with the submission receipt generated by eSubmission.  The participants will receive instructions how to participate in the opening and an invitation at  least two hours before the scheduled start of the opening session. The instructions and the  invitation will be sent to each representative’s email address provided as requested above.  The public part of the opening session will be strictly limited to the following aspects:  - verification that each tender has been submitted in accordance with the submission  requirements of the call for tenders;  $^{7}$ Working days at the contracting authority's location indicated under Heading I.1 of the contract notice.  3  3.2 Opening of tenders  3.1 Submission phase (before the time-limit for receipt of tenders)  3. Contacts during the procurement procedure. 