writemode is used with the built-in procedure open to specify that the file variable should be opened in write-only mode, and with the built-in procedure popen to specify that the pipe should be opened for writing.
open(file_variable, 'filename', writemode); //open for writing
open(file_variable, 'filename', readmode+writemode); //open for reading and writing
open(file_variable, 'filename', readmode or writemode); //open for reading and writing
Operating Systems: All
Standard Pascal: No
writemode