PAGE IMPRESSION (which is the minimum currency) 

A file, or a combination of files, sent to a BROWSER as a result of that BROWSER's request being received by the server.

AUTOMATED PAGE IMPRESSION

A PAGE IMPRESSION sent to a valid BROWSER resulting from an automatic process.

CHAT IMPRESSION

A file, or combination of files, sent to a valid BROWSER while the BROWSER is involved in an interactive Chat session, i.e., a PAGE IMPRESSION generated by a Chat URL. Chat URLs show the input of one or more concurrent BROWSERs, visible to each other, updated frequently, so as to enable a text based conversation.

STREAM IMPRESSION

The start of a media file stream sent to a valid BROWSER as a result of that BROWSER'S request being received by the server.

INTERACTIVE IMPRESSION

An interactive media file, or a combination of files, sent to a valid BROWSER as a result of the BROWSER'S request being received by the server.

WAP IMPRESSION

A WML file, or a combination of WML files, sent to a valid BROWSER as a result of that BROWSER'S request being received by the server.

INTERACTIVE TV IMPRESSION

A file, or a combination of files, sent to a valid BROWSER as a result of that BROWSER's request being received by the server.