Windows Emulator (via http://www.reddit.com/r/ProgrammerHumor/comments/19yris/windows_being_helpful_as_always/ )

net.c

#include <stdlib.h>
#include <stdio.h>

int print_error(int errorcode) {
    FILE *fp;
    char cmd[100];
    char out[1000];

    sprintf(cmd, "NET HELPMSG %d'", errorcode);
    fp = popen(cmd, "r");

    while (fgets(out, sizeof(out)-1, fp) != NULL) {
        /* replace *** with service name here; I’m too lazy to write that here because C doesn’t have easy string replacement AFAIK, and if it doesn’t, share a link. */
        printf("%s", out);
    }

    pclose(fp);
    printf("\nLess help is available by typing NET HELPMSG %d.\n\n\n", errorcode);
    return 0;
}

int main() {
    print_error(3521);
    return 0;
}