The CDS extractor is a web based application to extract cds data from the ncbi databases. The usage is quite simple: You have a web interface where you can enter the data of interest You can enter following data

Gene Name	A name of a gene
Email	Your (or an) email address provided fpr ncbi
Phylogroups	The phylogenetic groups of interest. You may select one or more organism / species. You can also select a group or deselect a group, which includes select or deselet all spcies which are inside the group. A group has an arrow to the left, where you can open or close the group content. A group can have sub groups, too. On the right side there is a minus / plus button. That means to deslect or select all members in a group.
Codons	The tpye of codons

After you enter and submit the request by clicking on "OK" you get a note: "Start Request...". The next step is looking for a so called "free slot" on an application server where the process will be executed. The second step is when there is no slot free: you "Server is busy! Waiting..." that means there will a delay for a short time and the excution will be restarted. If the proces started you get "Starting calculation - Please wait...". In general you have to wait for a short time - DON'T CLOSE the brwoser now or switch to anther web page! This waiting time may be seconds - up to around 1 minute. When the request is finished you get a note "Result is generated" - along with a butoon where you can download the result fasta file. That is all! The generated data will not be stored anywhere on a server! So you have to store the data locally on your own computer :)