Just as response to start is used in the ESL program to perform certain operations at program startup, response to start, when defined within a block, is used to perform specified operations immediately after the block becomes active; for example:
response to File
begin FileBlock
response to start
make File yellow
make FilePull visible
change Prompt to
font "large" text center
"Select the filename"
response to FileText
...
response to FileOK
...
leave block
response to FileQuit
...
leave block
end FileBlock
Although the use of the response to start definition is recommended, the action statements or action routines in the response to start can be placed before the block is entered, with the same results; for example:
response to File
make File yellow
make FilePull visible
change Prompt to
...
read file ...
begin FileBlock
response to FileText
...
response to FileOK
...
response to FileQuit
...
end FileBlock
Just as there can be only one response to start in the ESL program to respond to program startup, there can be only one response to start within each block.
